diff --git a/reactos/drivers/network/afd/afd/tdi.c b/reactos/drivers/network/afd/afd/tdi.c
index e4059585556..39d4304b43a 100644
--- a/reactos/drivers/network/afd/afd/tdi.c
+++ b/reactos/drivers/network/afd/afd/tdi.c
@@ -766,9 +766,9 @@ NTSTATUS TdiSend
   PIO_COMPLETION_ROUTINE CompletionRoutine,
   PVOID CompletionContext )
 {
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PDEVICE_OBJECT DeviceObject;
     NTSTATUS Status = STATUS_SUCCESS;
-    PMDL Mdl = NULL;
+    PMDL Mdl;
 
     DeviceObject = IoGetRelatedDeviceObject(TransportObject);
     if (!DeviceObject) {
@@ -843,8 +843,8 @@ NTSTATUS TdiReceive(
     PVOID CompletionContext)
 {
     NTSTATUS Status = STATUS_SUCCESS;
-    PDEVICE_OBJECT DeviceObject = NULL;
-    PMDL Mdl = NULL;
+    PDEVICE_OBJECT DeviceObject;
+    PMDL Mdl;
 
     DeviceObject = IoGetRelatedDeviceObject(TransportObject);
     if (!DeviceObject) {
diff --git a/reactos/drivers/network/tcpip/tcpip/dispatch.c b/reactos/drivers/network/tcpip/tcpip/dispatch.c
index 63cece1cc99..3eacc972921 100644
--- a/reactos/drivers/network/tcpip/tcpip/dispatch.c
+++ b/reactos/drivers/network/tcpip/tcpip/dispatch.c
@@ -1265,9 +1265,9 @@ NTSTATUS DispTdiQueryInformationEx(
  *     Status of operation
  */
 {
-    PTCP_REQUEST_QUERY_INFORMATION_EX InputBuffer = NULL;
+    PTCP_REQUEST_QUERY_INFORMATION_EX InputBuffer;
     PTRANSPORT_CONTEXT TranContext;
-    PTI_QUERY_CONTEXT QueryContext = NULL;
+    PTI_QUERY_CONTEXT QueryContext;
     PVOID OutputBuffer;
     TDI_REQUEST Request;
     UINT Size;
diff --git a/reactos/ntoskrnl/cm/ntfunc.c b/reactos/ntoskrnl/cm/ntfunc.c
index 5e711853466..115eeb5f8af 100644
--- a/reactos/ntoskrnl/cm/ntfunc.c
+++ b/reactos/ntoskrnl/cm/ntfunc.c
@@ -299,7 +299,7 @@ NtCreateKey(OUT PHANDLE KeyHandle,
   unsigned i;
   REG_PRE_CREATE_KEY_INFORMATION PreCreateKeyInfo;
   REG_POST_CREATE_KEY_INFORMATION PostCreateKeyInfo;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   UNICODE_STRING CapturedClass = {0};
   HANDLE hKey;
 
@@ -1308,7 +1308,7 @@ NtOpenKey(OUT PHANDLE KeyHandle,
 	  IN POBJECT_ATTRIBUTES ObjectAttributes)
 {
   UNICODE_STRING RemainingPath;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   PVOID Object = NULL;
   HANDLE hKey = NULL;
   NTSTATUS Status = STATUS_SUCCESS;
@@ -2145,7 +2145,7 @@ NtDeleteValueKey (IN HANDLE KeyHandle,
   NTSTATUS Status;
   REG_DELETE_VALUE_KEY_INFORMATION DeleteValueKeyInfo;
   REG_POST_OPERATION_INFORMATION PostOperationInfo;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   UNICODE_STRING CapturedValueName;
 
   PAGED_CODE();
diff --git a/reactos/ntoskrnl/ex/sysinfo.c b/reactos/ntoskrnl/ex/sysinfo.c
index d39ccc71059..9459838e704 100644
--- a/reactos/ntoskrnl/ex/sysinfo.c
+++ b/reactos/ntoskrnl/ex/sysinfo.c
@@ -232,10 +232,10 @@ NtQuerySystemEnvironmentValue (IN	PUNICODE_STRING	VariableName,
   ANSI_STRING AName;
   UNICODE_STRING WName;
   BOOLEAN Result;
-  PCH Value = NULL;
+  PCH Value;
   ANSI_STRING AValue;
   UNICODE_STRING WValue;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   NTSTATUS Status = STATUS_SUCCESS;
 
   PAGED_CODE();
@@ -378,7 +378,7 @@ NtSetSystemEnvironmentValue (IN	PUNICODE_STRING	VariableName,
 {
   UNICODE_STRING CapturedName, CapturedValue;
   ANSI_STRING AName, AValue;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   NTSTATUS Status;
 
   PAGED_CODE();
diff --git a/reactos/ntoskrnl/ex/timer.c b/reactos/ntoskrnl/ex/timer.c
index cebc0f6faaf..3669608cc5a 100644
--- a/reactos/ntoskrnl/ex/timer.c
+++ b/reactos/ntoskrnl/ex/timer.c
@@ -510,7 +510,7 @@ NtQueryTimer(IN HANDLE TimerHandle,
 {
     PETIMER Timer;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
-    NTSTATUS Status = STATUS_UNSUCCESSFUL;
+    NTSTATUS Status;
     PTIMER_BASIC_INFORMATION BasicInfo = TimerInformation;
     PAGED_CODE();
 
diff --git a/reactos/ntoskrnl/fsrtl/fastio.c b/reactos/ntoskrnl/fsrtl/fastio.c
index 40b7481b93a..cc8bb6a9adb 100644
--- a/reactos/ntoskrnl/fsrtl/fastio.c
+++ b/reactos/ntoskrnl/fsrtl/fastio.c
@@ -83,7 +83,7 @@ FsRtlCopyRead(IN PFILE_OBJECT FileObject,
               IN PDEVICE_OBJECT DeviceObject)
 {
 
-    PFSRTL_COMMON_FCB_HEADER FcbHeader = NULL;
+    PFSRTL_COMMON_FCB_HEADER FcbHeader;
     LARGE_INTEGER Offset;
     PFAST_IO_DISPATCH FastIoDispatch;
     PDEVICE_OBJECT Device;
@@ -258,7 +258,7 @@ FsRtlCopyWrite(IN PFILE_OBJECT FileObject,
     BOOLEAN Result = TRUE;
     PFAST_IO_DISPATCH FastIoDispatch;
     PDEVICE_OBJECT Device;
-    PFSRTL_COMMON_FCB_HEADER FcbHeader = NULL;
+    PFSRTL_COMMON_FCB_HEADER FcbHeader;
 
     /* WDK doc. Offset=0xffffffffffffffff indicates append to the end of file */
     BOOLEAN FileOffsetAppend = ((FileOffset->HighPart == 0xffffffff) && (FileOffset->LowPart == 0xffffffff));
@@ -915,7 +915,7 @@ FsRtlMdlReadDev(IN PFILE_OBJECT FileObject,
                 OUT PIO_STATUS_BLOCK IoStatus,
                 IN PDEVICE_OBJECT DeviceObject)
 {
-    PFSRTL_COMMON_FCB_HEADER FcbHeader = NULL;
+    PFSRTL_COMMON_FCB_HEADER FcbHeader;
     BOOLEAN Result = TRUE;
     LARGE_INTEGER Offset;
     PFAST_IO_DISPATCH FastIoDispatch;
@@ -1159,7 +1159,7 @@ FsRtlPrepareMdlWriteDev(IN PFILE_OBJECT FileObject,
     BOOLEAN Result = TRUE;
     PFAST_IO_DISPATCH FastIoDispatch;
     PDEVICE_OBJECT Device;
-    PFSRTL_COMMON_FCB_HEADER FcbHeader = NULL;
+    PFSRTL_COMMON_FCB_HEADER FcbHeader;
     
     LARGE_INTEGER OldFileSize;
     LARGE_INTEGER OldValidDataLength;
diff --git a/reactos/ntoskrnl/io/iomgr/driver.c b/reactos/ntoskrnl/io/iomgr/driver.c
index b237dd16ae7..15421c73986 100644
--- a/reactos/ntoskrnl/io/iomgr/driver.c
+++ b/reactos/ntoskrnl/io/iomgr/driver.c
@@ -1475,7 +1475,7 @@ NtLoadDriver(IN PUNICODE_STRING DriverServiceName)
    UNICODE_STRING ImagePath;
    UNICODE_STRING ServiceName;
    UNICODE_STRING CapturedDriverServiceName = {0};
-   KPROCESSOR_MODE PreviousMode = {0};
+   KPROCESSOR_MODE PreviousMode;
    NTSTATUS Status;
    ULONG Type;
    PDEVICE_NODE DeviceNode;
diff --git a/reactos/ntoskrnl/io/iomgr/file.c b/reactos/ntoskrnl/io/iomgr/file.c
index 651f3f07ea8..6c0d4f52080 100644
--- a/reactos/ntoskrnl/io/iomgr/file.c
+++ b/reactos/ntoskrnl/io/iomgr/file.c
@@ -1629,7 +1629,7 @@ IoCreateFile(OUT PHANDLE FileHandle,
              IN PVOID ExtraCreateParameters OPTIONAL,
              IN ULONG Options)
 {
-    KPROCESSOR_MODE AccessMode = {0};
+    KPROCESSOR_MODE AccessMode;
     HANDLE LocalHandle = 0;
     LARGE_INTEGER SafeAllocationSize;
     PVOID SystemEaBuffer = NULL;
diff --git a/reactos/ntoskrnl/io/iomgr/iofunc.c b/reactos/ntoskrnl/io/iomgr/iofunc.c
index dbab87501ca..5d6f7ab31c1 100644
--- a/reactos/ntoskrnl/io/iomgr/iofunc.c
+++ b/reactos/ntoskrnl/io/iomgr/iofunc.c
@@ -198,12 +198,12 @@ IopDeviceFsIoControl(IN HANDLE DeviceHandle,
 {
     NTSTATUS Status = STATUS_SUCCESS;
     PFILE_OBJECT FileObject;
-    PDEVICE_OBJECT DeviceObject = NULL;
-    PIRP Irp = NULL;
+    PDEVICE_OBJECT DeviceObject;
+    PIRP Irp;
     PIO_STACK_LOCATION StackPtr;
     PKEVENT EventObject = NULL;
     BOOLEAN LockedForSynch = FALSE;
-    ULONG AccessType = 0;
+    ULONG AccessType;
     OBJECT_HANDLE_INFORMATION HandleInformation;
     ACCESS_MASK DesiredAccess;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
@@ -1212,9 +1212,9 @@ NtLockFile(IN HANDLE FileHandle,
 {
     PFILE_OBJECT FileObject;
     PLARGE_INTEGER LocalLength = NULL;
-    PIRP Irp = NULL;
-    PIO_STACK_LOCATION StackPtr = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PIRP Irp;
+    PIO_STACK_LOCATION StackPtr;
+    PDEVICE_OBJECT DeviceObject;
     PKEVENT Event = NULL;
     BOOLEAN LockedForSync = FALSE;
     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
@@ -1386,8 +1386,8 @@ NtQueryDirectoryFile(IN HANDLE FileHandle,
                      IN PUNICODE_STRING FileName OPTIONAL,
                      IN BOOLEAN RestartScan)
 {
-    PIRP Irp = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PIRP Irp;
+    PDEVICE_OBJECT DeviceObject;
     PFILE_OBJECT FileObject;
     PIO_STACK_LOCATION StackPtr;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
@@ -1627,9 +1627,9 @@ NtQueryInformationFile(IN HANDLE FileHandle,
     OBJECT_HANDLE_INFORMATION HandleInformation;
     PFILE_OBJECT FileObject;
     NTSTATUS Status = STATUS_SUCCESS;
-    PIRP Irp = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
-    PIO_STACK_LOCATION StackPtr = NULL;
+    PIRP Irp;
+    PDEVICE_OBJECT DeviceObject;
+    PIO_STACK_LOCATION StackPtr;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
     PKEVENT Event = NULL;
     BOOLEAN LocalEvent = FALSE;
@@ -1938,8 +1938,8 @@ NtReadFile(IN HANDLE FileHandle,
 {
     NTSTATUS Status = STATUS_SUCCESS;
     PFILE_OBJECT FileObject;
-    PIRP Irp = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PIRP Irp;
+    PDEVICE_OBJECT DeviceObject;
     PIO_STACK_LOCATION StackPtr;
     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
     PKEVENT EventObject = NULL;
@@ -2197,9 +2197,9 @@ NtSetInformationFile(IN HANDLE FileHandle,
 {
     PFILE_OBJECT FileObject;
     NTSTATUS Status = STATUS_SUCCESS;
-    PIRP Irp = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
-    PIO_STACK_LOCATION StackPtr = NULL;
+    PIRP Irp;
+    PDEVICE_OBJECT DeviceObject;
+    PIO_STACK_LOCATION StackPtr;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
     PKEVENT Event = NULL;
     BOOLEAN LocalEvent = FALSE;
@@ -2576,9 +2576,9 @@ NtUnlockFile(IN HANDLE FileHandle,
 {
     PFILE_OBJECT FileObject;
     PLARGE_INTEGER LocalLength = NULL;
-    PIRP Irp = NULL;
-    PIO_STACK_LOCATION StackPtr = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PIRP Irp;
+    PIO_STACK_LOCATION StackPtr;
+    PDEVICE_OBJECT DeviceObject;
     PKEVENT Event = NULL;
     BOOLEAN LocalEvent = FALSE;
     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
@@ -2760,8 +2760,8 @@ NtWriteFile(IN HANDLE FileHandle,
 {
     NTSTATUS Status = STATUS_SUCCESS;
     PFILE_OBJECT FileObject;
-    PIRP Irp = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PIRP Irp;
+    PDEVICE_OBJECT DeviceObject;
     PIO_STACK_LOCATION StackPtr;
     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
     PKEVENT EventObject = NULL;
@@ -3027,9 +3027,9 @@ NtQueryVolumeInformationFile(IN HANDLE FileHandle,
                              IN FS_INFORMATION_CLASS FsInformationClass)
 {
     PFILE_OBJECT FileObject;
-    PIRP Irp = NULL;
-    PIO_STACK_LOCATION StackPtr = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PIRP Irp;
+    PIO_STACK_LOCATION StackPtr;
+    PDEVICE_OBJECT DeviceObject;
     PKEVENT Event = NULL;
     BOOLEAN LocalEvent = FALSE;
     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
@@ -3190,9 +3190,9 @@ NtSetVolumeInformationFile(IN HANDLE FileHandle,
                            IN FS_INFORMATION_CLASS FsInformationClass)
 {
     PFILE_OBJECT FileObject;
-    PIRP Irp = NULL;
-    PIO_STACK_LOCATION StackPtr = NULL;
-    PDEVICE_OBJECT DeviceObject = NULL;
+    PIRP Irp;
+    PIO_STACK_LOCATION StackPtr;
+    PDEVICE_OBJECT DeviceObject;
     PKEVENT Event = NULL;
     BOOLEAN LocalEvent = FALSE;
     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
diff --git a/reactos/ntoskrnl/io/iomgr/irp.c b/reactos/ntoskrnl/io/iomgr/irp.c
index f4cefae62bf..2f6c0a149f8 100644
--- a/reactos/ntoskrnl/io/iomgr/irp.c
+++ b/reactos/ntoskrnl/io/iomgr/irp.c
@@ -610,8 +610,8 @@ IoBuildAsynchronousFsdRequest(IN ULONG MajorFunction,
                               IN PLARGE_INTEGER StartingOffset,
                               IN PIO_STATUS_BLOCK IoStatusBlock)
 {
-    PIRP Irp = NULL;
-    PIO_STACK_LOCATION StackPtr = NULL;
+    PIRP Irp;
+    PIO_STACK_LOCATION StackPtr;
 
     /* Allocate IRP */
     Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
@@ -745,7 +745,7 @@ IoBuildDeviceIoControlRequest(IN ULONG IoControlCode,
                               IN PKEVENT Event,
                               IN PIO_STATUS_BLOCK IoStatusBlock)
 {
-    PIRP Irp = NULL;
+    PIRP Irp;
     PIO_STACK_LOCATION StackPtr;
     ULONG BufferLength;
 
diff --git a/reactos/ntoskrnl/io/pnpmgr/plugplay.c b/reactos/ntoskrnl/io/pnpmgr/plugplay.c
index b9124e22e8e..5d8a8be3da4 100644
--- a/reactos/ntoskrnl/io/pnpmgr/plugplay.c
+++ b/reactos/ntoskrnl/io/pnpmgr/plugplay.c
@@ -443,7 +443,7 @@ IopGetDeviceProperty(PPLUGPLAY_CONTROL_PROPERTY_DATA PropertyData)
     UNICODE_STRING DeviceInstance;
     ULONG BufferSize;
     ULONG Property = 0;
-    PVOID Buffer = NULL;
+    PVOID Buffer;
 
     DPRINT("IopGetDeviceProperty() called\n");
     DPRINT("Device name: %wZ\n", &PropertyData->DeviceInstance);
diff --git a/reactos/ntoskrnl/ke/i386/usercall.c b/reactos/ntoskrnl/ke/i386/usercall.c
index 1fa1083563b..d70d3e24e18 100644
--- a/reactos/ntoskrnl/ke/i386/usercall.c
+++ b/reactos/ntoskrnl/ke/i386/usercall.c
@@ -148,8 +148,8 @@ KeUserModeCallback(IN ULONG RoutineIndex,
                    OUT PVOID *Result,
                    OUT PULONG ResultLength)
 {
-    ULONG_PTR NewStack =0, OldStack = 0;
-    PULONG UserEsp = NULL;
+    ULONG_PTR NewStack, OldStack;
+    PULONG UserEsp;
     NTSTATUS CallbackStatus = STATUS_SUCCESS;
     PEXCEPTION_REGISTRATION_RECORD ExceptionList;
     PTEB Teb;
diff --git a/reactos/ntoskrnl/ke/thrdobj.c b/reactos/ntoskrnl/ke/thrdobj.c
index b5b2cd9ecbc..dd87225aec1 100644
--- a/reactos/ntoskrnl/ke/thrdobj.c
+++ b/reactos/ntoskrnl/ke/thrdobj.c
@@ -723,7 +723,7 @@ KeInitThread(IN OUT PKTHREAD Thread,
     ULONG i;
     PKWAIT_BLOCK TimerWaitBlock;
     PKTIMER Timer;
-    NTSTATUS Status = STATUS_UNSUCCESSFUL;
+    NTSTATUS Status;
 
     /* Initalize the Dispatcher Header */
     KeInitializeDispatcherHeader(&Thread->DispatcherHeader,
diff --git a/reactos/ntoskrnl/mm/section.c b/reactos/ntoskrnl/mm/section.c
index 293d4c4728f..6177c7ec13f 100644
--- a/reactos/ntoskrnl/mm/section.c
+++ b/reactos/ntoskrnl/mm/section.c
@@ -3670,7 +3670,7 @@ NtMapViewOfSection(IN HANDLE SectionHandle,
    SIZE_T SafeViewSize;
    PROS_SECTION_OBJECT Section;
    PEPROCESS Process;
-   KPROCESSOR_MODE PreviousMode = {0};
+   KPROCESSOR_MODE PreviousMode;
    PMADDRESS_SPACE AddressSpace;
    NTSTATUS Status = STATUS_SUCCESS;
    ULONG tmpProtect;
diff --git a/reactos/ntoskrnl/mm/virtual.c b/reactos/ntoskrnl/mm/virtual.c
index 9e73e4996d6..5b248b42ad3 100644
--- a/reactos/ntoskrnl/mm/virtual.c
+++ b/reactos/ntoskrnl/mm/virtual.c
@@ -554,10 +554,10 @@ NtReadVirtualMemory(IN HANDLE ProcessHandle,
                     IN ULONG NumberOfBytesToRead,
                     OUT PULONG NumberOfBytesRead OPTIONAL)
 {
-   PMDL Mdl = NULL;
+   PMDL Mdl;
    PVOID SystemAddress;
-   KPROCESSOR_MODE PreviousMode = {0};
-   PEPROCESS Process, CurrentProcess = NULL;
+   KPROCESSOR_MODE PreviousMode;
+   PEPROCESS Process, CurrentProcess;
    NTSTATUS Status = STATUS_SUCCESS;
 
    PAGED_CODE();
@@ -769,11 +769,11 @@ NtWriteVirtualMemory(IN HANDLE ProcessHandle,
                      IN ULONG NumberOfBytesToWrite,
                      OUT PULONG NumberOfBytesWritten  OPTIONAL)
 {
-   PMDL Mdl = NULL;
-   PVOID SystemAddress = NULL;
+   PMDL Mdl;
+   PVOID SystemAddress;
    PEPROCESS Process;
-   KPROCESSOR_MODE PreviousMode = {0};
-   NTSTATUS CopyStatus = STATUS_SUCCESS, Status = STATUS_SUCCESS;
+   KPROCESSOR_MODE PreviousMode;
+   NTSTATUS CopyStatus, Status = STATUS_SUCCESS;
 
    DPRINT("NtWriteVirtualMemory(ProcessHandle %x, BaseAddress %x, "
           "Buffer %x, NumberOfBytesToWrite %d)\n",ProcessHandle,BaseAddress,
diff --git a/reactos/ntoskrnl/ob/obdir.c b/reactos/ntoskrnl/ob/obdir.c
index 84dac527353..882a439a62c 100644
--- a/reactos/ntoskrnl/ob/obdir.c
+++ b/reactos/ntoskrnl/ob/obdir.c
@@ -466,7 +466,7 @@ NtQueryDirectoryObject(IN HANDLE DirectoryHandle,
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
     ULONG SkipEntries = 0;
     NTSTATUS Status = STATUS_SUCCESS;
-    PVOID LocalBuffer = NULL;
+    PVOID LocalBuffer;
     POBJECT_DIRECTORY_INFORMATION DirectoryInfo;
     ULONG Length, TotalLength;
     ULONG Count, CurrentEntry;
diff --git a/reactos/ntoskrnl/ob/obhandle.c b/reactos/ntoskrnl/ob/obhandle.c
index 1081a438bfd..a2d771f06a0 100644
--- a/reactos/ntoskrnl/ob/obhandle.c
+++ b/reactos/ntoskrnl/ob/obhandle.c
@@ -3150,7 +3150,7 @@ NtDuplicateObject(IN HANDLE SourceProcessHandle,
                   IN ULONG HandleAttributes,
                   IN ULONG Options)
 {
-    PEPROCESS SourceProcess, TargetProcess, Target = NULL;
+    PEPROCESS SourceProcess, TargetProcess, Target;
     HANDLE hTarget;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
     NTSTATUS Status = STATUS_SUCCESS;
diff --git a/reactos/ntoskrnl/ob/obwait.c b/reactos/ntoskrnl/ob/obwait.c
index b3275743d6c..a110604b6d5 100644
--- a/reactos/ntoskrnl/ob/obwait.c
+++ b/reactos/ntoskrnl/ob/obwait.c
@@ -56,7 +56,7 @@ NtWaitForMultipleObjects(IN ULONG ObjectCount,
     ULONG i = 0, ReferencedObjects = 0, j;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
     LARGE_INTEGER SafeTimeOut;
-    BOOLEAN LockInUse = FALSE;
+    BOOLEAN LockInUse;
     PHANDLE_TABLE_ENTRY HandleEntry;
     POBJECT_HEADER ObjectHeader;
     PHANDLE_TABLE HandleTable;
@@ -457,7 +457,7 @@ NtSignalAndWaitForSingleObject(IN HANDLE ObjectHandleToSignal,
 {
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
     POBJECT_TYPE Type;
-    PVOID SignalObj, WaitObj, WaitableObject = NULL;
+    PVOID SignalObj, WaitObj, WaitableObject;
     LARGE_INTEGER SafeTimeOut;
     OBJECT_HANDLE_INFORMATION HandleInfo;
     NTSTATUS Status = STATUS_SUCCESS;
diff --git a/reactos/ntoskrnl/ps/job.c b/reactos/ntoskrnl/ps/job.c
index 981a7835fae..6af27b35387 100644
--- a/reactos/ntoskrnl/ps/job.c
+++ b/reactos/ntoskrnl/ps/job.c
@@ -225,8 +225,8 @@ NtCreateJobObject (
 {
     HANDLE hJob;
     PEJOB Job;
-    KPROCESSOR_MODE PreviousMode = {0};
-    PEPROCESS CurrentProcess = NULL;
+    KPROCESSOR_MODE PreviousMode;
+    PEPROCESS CurrentProcess;
     NTSTATUS Status = STATUS_SUCCESS;
 
     PAGED_CODE();
@@ -396,7 +396,7 @@ NtOpenJobObject (
     ACCESS_MASK DesiredAccess,
     POBJECT_ATTRIBUTES ObjectAttributes)
 {
-    KPROCESSOR_MODE PreviousMode = {0};
+    KPROCESSOR_MODE PreviousMode;
     HANDLE hJob;
     NTSTATUS Status = STATUS_SUCCESS;
 
diff --git a/reactos/ntoskrnl/ps/query.c b/reactos/ntoskrnl/ps/query.c
index 3d465f48106..6d5fbcb420f 100644
--- a/reactos/ntoskrnl/ps/query.c
+++ b/reactos/ntoskrnl/ps/query.c
@@ -484,7 +484,7 @@ NtSetInformationProcess(IN HANDLE ProcessHandle,
     PEPROCESS Process;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
     ACCESS_MASK Access;
-    NTSTATUS Status = STATUS_NOT_IMPLEMENTED;
+    NTSTATUS Status;
     HANDLE PortHandle = NULL;
     HANDLE TokenHandle = NULL;
     PROCESS_SESSION_INFORMATION SessionInfo = {0};
@@ -719,7 +719,7 @@ NtSetInformationThread(IN HANDLE ThreadHandle,
     PETHREAD Thread;
     ULONG Access;
     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
-    NTSTATUS Status = STATUS_INVALID_PARAMETER;
+    NTSTATUS Status;
     HANDLE TokenHandle = NULL;
     KPRIORITY Priority = 0;
     KAFFINITY Affinity = 0, CombinedAffinity;
diff --git a/reactos/ntoskrnl/ps/thread.c b/reactos/ntoskrnl/ps/thread.c
index f1920207ebd..5c6012bb98b 100644
--- a/reactos/ntoskrnl/ps/thread.c
+++ b/reactos/ntoskrnl/ps/thread.c
@@ -141,7 +141,7 @@ NTAPI
 PspSystemThreadStartup(IN PKSTART_ROUTINE StartRoutine,
                        IN PVOID StartContext)
 {
-    PETHREAD Thread = NULL;
+    PETHREAD Thread;
     PSTRACE(PS_THREAD_DEBUG,
             "StartRoutine: %p StartContext: %p\n", StartRoutine, StartContext);
 
diff --git a/reactos/ntoskrnl/se/acl.c b/reactos/ntoskrnl/se/acl.c
index 575e6ffd188..2ed35412892 100644
--- a/reactos/ntoskrnl/se/acl.c
+++ b/reactos/ntoskrnl/se/acl.c
@@ -275,7 +275,7 @@ SepCaptureAcl(IN PACL InputAcl,
               IN BOOLEAN CaptureIfKernel,
               OUT PACL *CapturedAcl)
 {
-  PACL NewAcl = NULL;
+  PACL NewAcl;
   ULONG AclSize = 0;
   NTSTATUS Status = STATUS_SUCCESS;
 
diff --git a/reactos/ntoskrnl/se/priv.c b/reactos/ntoskrnl/se/priv.c
index b7ec8035e6b..f1341ed7634 100644
--- a/reactos/ntoskrnl/se/priv.c
+++ b/reactos/ntoskrnl/se/priv.c
@@ -184,7 +184,7 @@ SeCaptureLuidAndAttributesArray (PLUID_AND_ATTRIBUTES Src,
 				 PLUID_AND_ATTRIBUTES* Dest,
 				 PULONG Length)
 {
-    ULONG BufferSize = 0;
+    ULONG BufferSize;
     NTSTATUS Status = STATUS_SUCCESS;
 
     PAGED_CODE();
@@ -300,7 +300,7 @@ NtPrivilegeCheck (IN HANDLE ClientToken,
   ULONG PrivilegeControl = 0;
   ULONG Length;
   BOOLEAN CheckResult;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   NTSTATUS Status = STATUS_SUCCESS;
 
   PAGED_CODE();
diff --git a/reactos/ntoskrnl/se/sd.c b/reactos/ntoskrnl/se/sd.c
index e7c33652f01..3d27f6910f9 100644
--- a/reactos/ntoskrnl/se/sd.c
+++ b/reactos/ntoskrnl/se/sd.c
@@ -394,7 +394,7 @@ SeCaptureSecurityDescriptor(
 {
   PISECURITY_DESCRIPTOR OriginalSecurityDescriptor = _OriginalSecurityDescriptor;
   SECURITY_DESCRIPTOR DescriptorCopy;
-  PISECURITY_DESCRIPTOR NewDescriptor = NULL;
+  PISECURITY_DESCRIPTOR NewDescriptor;
   ULONG OwnerSAC = 0, GroupSAC = 0;
   ULONG OwnerSize = 0, GroupSize = 0;
   ULONG SaclSize = 0, DaclSize = 0;
diff --git a/reactos/ntoskrnl/se/sid.c b/reactos/ntoskrnl/se/sid.c
index 8e6538786e4..541fca02562 100644
--- a/reactos/ntoskrnl/se/sid.c
+++ b/reactos/ntoskrnl/se/sid.c
@@ -236,7 +236,7 @@ SepCaptureSid(IN PSID InputSid,
               OUT PSID *CapturedSid)
 {
   ULONG SidSize = 0;
-  PISID NewSid = NULL, Sid = (PISID)InputSid;
+  PISID NewSid, Sid = (PISID)InputSid;
   NTSTATUS Status = STATUS_SUCCESS;
 
   PAGED_CODE();
diff --git a/reactos/ntoskrnl/se/token.c b/reactos/ntoskrnl/se/token.c
index c1457457baf..1b443db6030 100644
--- a/reactos/ntoskrnl/se/token.c
+++ b/reactos/ntoskrnl/se/token.c
@@ -669,8 +669,8 @@ NtQueryInformationToken(IN HANDLE TokenHandle,
     ULONG Ulong;
   } Unused;
   PTOKEN Token;
-  ULONG RequiredLength = 0;
-  KPROCESSOR_MODE PreviousMode = {0};
+  ULONG RequiredLength;
+  KPROCESSOR_MODE PreviousMode;
   NTSTATUS Status = STATUS_SUCCESS;
 
   PAGED_CODE();
@@ -1253,7 +1253,7 @@ NtSetInformationToken(IN HANDLE TokenHandle,
 		      IN ULONG TokenInformationLength)
 {
   PTOKEN Token;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   ULONG NeededAccess = TOKEN_ADJUST_DEFAULT;
   NTSTATUS Status = STATUS_SUCCESS;
 
@@ -1496,7 +1496,7 @@ NtDuplicateToken(IN HANDLE ExistingTokenHandle,
                  IN TOKEN_TYPE TokenType,
                  OUT PHANDLE NewTokenHandle)
 {
-    KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   HANDLE hToken;
   PTOKEN Token;
   PTOKEN NewToken;
@@ -2134,7 +2134,7 @@ NtCreateToken(OUT PHANDLE TokenHandle,
   PVOID EndMem;
   ULONG uLength;
   ULONG i;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   ULONG nTokenPrivileges = 0;
   LARGE_INTEGER LocalExpirationTime = {{0}};
   NTSTATUS Status = STATUS_SUCCESS;
@@ -2464,7 +2464,7 @@ NtOpenThreadTokenEx(IN HANDLE ThreadHandle,
   OBJECT_ATTRIBUTES ObjectAttributes;
   SECURITY_DESCRIPTOR SecurityDescriptor;
   PACL Dacl = NULL;
-  KPROCESSOR_MODE PreviousMode = {0};
+  KPROCESSOR_MODE PreviousMode;
   NTSTATUS Status = STATUS_SUCCESS;
 
   PAGED_CODE();
@@ -2661,7 +2661,7 @@ NtCompareTokens(IN HANDLE FirstTokenHandle,
                 IN HANDLE SecondTokenHandle,
                 OUT PBOOLEAN Equal)
 {
-    KPROCESSOR_MODE PreviousMode = {0};
+    KPROCESSOR_MODE PreviousMode;
     PTOKEN FirstToken, SecondToken;
     BOOLEAN IsEqual;
     NTSTATUS Status = STATUS_SUCCESS;
diff --git a/reactos/subsystems/win32/win32k/ntddraw/dd.c b/reactos/subsystems/win32/win32k/ntddraw/dd.c
index 9b3559516db..d02c19ce541 100644
--- a/reactos/subsystems/win32/win32k/ntddraw/dd.c
+++ b/reactos/subsystems/win32/win32k/ntddraw/dd.c
@@ -40,11 +40,11 @@ DWORD STDCALL NtGdiDdCreateSurface(
     HANDLE *puhSurface
 )
 {
-    INT i = 0;
+    INT i;
     DWORD  ddRVal = DDHAL_DRIVER_NOTHANDLED;
     NTSTATUS Status = FALSE;
-    PDD_DIRECTDRAW pDirectDraw = NULL;
-    PDD_SURFACE phsurface = NULL;
+    PDD_DIRECTDRAW pDirectDraw;
+    PDD_SURFACE phsurface;
 
     PDD_SURFACE_LOCAL pLocal;
     PDD_SURFACE_MORE pMore;
@@ -53,7 +53,7 @@ DWORD STDCALL NtGdiDdCreateSurface(
     DD_CREATESURFACEDATA CreateSurfaceData;
 
     /* FIXME alloc so mayne we need */
-    PHANDLE *myhSurface = NULL;
+    PHANDLE *myhSurface;
 
     /* GCC4  warnns on value are unisitaed,
        but they are initated in seh 
@@ -508,7 +508,7 @@ NtGdiDdGetScanLine( HANDLE hDirectDrawLocal, PDD_GETSCANLINEDATA puGetScanLineDa
 {
     DWORD  ddRVal = DDHAL_DRIVER_NOTHANDLED;
     DD_GETSCANLINEDATA GetScanLineData;
-    PDD_DIRECTDRAW pDirectDraw = NULL;
+    PDD_DIRECTDRAW pDirectDraw;
     NTSTATUS Status = FALSE;
 
     DPRINT1("NtGdiDdGetScanLine\n");
diff --git a/reactos/subsystems/win32/win32k/ntddraw/ddraw.c b/reactos/subsystems/win32/win32k/ntddraw/ddraw.c
index e3ce1df44bb..d89207aa0c1 100644
--- a/reactos/subsystems/win32/win32k/ntddraw/ddraw.c
+++ b/reactos/subsystems/win32/win32k/ntddraw/ddraw.c
@@ -292,7 +292,7 @@ NtGdiDdQueryDirectDrawObject(
     DWORD *puFourCC
 )
 {
-    PDD_DIRECTDRAW pDirectDraw = NULL;
+    PDD_DIRECTDRAW pDirectDraw;
     NTSTATUS Status = FALSE;
     BOOL Ret=FALSE;
 
@@ -549,7 +549,7 @@ BOOL STDCALL NtGdiDdReenableDirectDrawObject(
 {
     BOOL Ret=FALSE;
     NTSTATUS Status = FALSE;
-    PDD_DIRECTDRAW pDirectDraw = NULL;
+    PDD_DIRECTDRAW pDirectDraw;
 
     if (hDirectDrawLocal == NULL)
     {
diff --git a/reactos/subsystems/win32/win32k/ntuser/class.c b/reactos/subsystems/win32/win32k/ntuser/class.c
index f4ddd38afd2..d77b115321a 100644
--- a/reactos/subsystems/win32/win32k/ntuser/class.c
+++ b/reactos/subsystems/win32/win32k/ntuser/class.c
@@ -1137,7 +1137,7 @@ UserRegisterClass(IN CONST WNDCLASSEXW* lpwcx,
                   IN DWORD dwFlags)
 {
     PW32THREADINFO ti;
-    PW32PROCESSINFO pi = NULL;
+    PW32PROCESSINFO pi;
     PWINDOWCLASS Class;
     RTL_ATOM ClassAtom;
     RTL_ATOM Ret = (RTL_ATOM)0;
@@ -1484,7 +1484,7 @@ IntSetClassMenuName(IN PWINDOWCLASS Class,
     if (MenuName->Length != 0)
     {
         ANSI_STRING AnsiString;
-        PWSTR strBufW = NULL;
+        PWSTR strBufW;
 
         AnsiString.MaximumLength = RtlUnicodeStringToAnsiSize(MenuName);
 
diff --git a/reactos/subsystems/win32/win32k/objects/brush.c b/reactos/subsystems/win32/win32k/objects/brush.c
index 685314c2ac3..87fc8f201a1 100644
--- a/reactos/subsystems/win32/win32k/objects/brush.c
+++ b/reactos/subsystems/win32/win32k/objects/brush.c
@@ -628,7 +628,7 @@ NtGdiCreateDIBBrush(
    IN BOOL bPen,
    IN PVOID PackedDIB)
 {
-   BITMAPINFO *SafeBitmapInfoAndData = NULL;
+   BITMAPINFO *SafeBitmapInfoAndData;
    NTSTATUS Status = STATUS_SUCCESS;
    HBRUSH hBrush;
 
diff --git a/reactos/subsystems/win32/win32k/objects/cliprgn.c b/reactos/subsystems/win32/win32k/objects/cliprgn.c
index 6a936cfab06..3e812b5d341 100644
--- a/reactos/subsystems/win32/win32k/objects/cliprgn.c
+++ b/reactos/subsystems/win32/win32k/objects/cliprgn.c
@@ -203,7 +203,7 @@ IntGdiGetClipBox(HDC hDC, LPRECT rc)
 int STDCALL NtGdiGetClipBox(HDC  hDC,
 			   LPRECT  rc)
 {
-  int Ret = FALSE;
+  int Ret;
   NTSTATUS Status = STATUS_SUCCESS;
   RECT Saferect;
 
diff --git a/reactos/subsystems/win32/win32k/objects/coord.c b/reactos/subsystems/win32/win32k/objects/coord.c
index 7ab1cfaa9b1..1b91251e947 100644
--- a/reactos/subsystems/win32/win32k/objects/coord.c
+++ b/reactos/subsystems/win32/win32k/objects/coord.c
@@ -82,7 +82,7 @@ BOOL STDCALL NtGdiCombineTransform(LPXFORM  UnsafeXFormResult,
   XFORM  xformTemp;
   XFORM  xform1 = {0}, xform2 = {0};
   NTSTATUS Status = STATUS_SUCCESS;
-  BOOL Ret = FALSE;
+  BOOL Ret;
 
   _SEH_TRY
   {
@@ -170,10 +170,10 @@ NtGdiDPtoLP(HDC  hDC,
 	   LPPOINT  UnsafePoints,
 	   int  Count)
 {
-   PDC dc = NULL;
+   PDC dc;
    NTSTATUS Status = STATUS_SUCCESS;
-   LPPOINT Points = NULL;
-   ULONG Size = 0;
+   LPPOINT Points;
+   ULONG Size;
 
    dc = DC_LockDc(hDC);
    if (!dc)
@@ -320,7 +320,7 @@ STDCALL
 NtGdiGetWorldTransform(HDC  hDC,
                       LPXFORM  XForm)
 {
-  PDC  dc = NULL;
+  PDC  dc;
   NTSTATUS Status = STATUS_SUCCESS;
 
   dc = DC_LockDc ( hDC );
@@ -393,10 +393,10 @@ IntLPtoDP ( PDC dc, LPPOINT Points, INT Count )
 BOOL STDCALL
 NtGdiLPtoDP ( HDC hDC, LPPOINT UnsafePoints, INT Count )
 {
-   PDC dc = NULL;
+   PDC dc;
    NTSTATUS Status = STATUS_SUCCESS;
-   LPPOINT Points = NULL;
-   ULONG Size = 0;
+   LPPOINT Points;
+   ULONG Size;
 
    dc = DC_LockDc(hDC);
    if (!dc)
@@ -479,7 +479,7 @@ NtGdiModifyWorldTransform(HDC hDC,
                           CONST LPXFORM  UnsafeXForm,
                           DWORD Mode)
 {
-   PDC dc = NULL;
+   PDC dc;
    XFORM SafeXForm;
    BOOL Ret = FALSE;
 
@@ -520,7 +520,7 @@ NtGdiOffsetViewportOrgEx(HDC hDC,
                         int YOffset,
                         LPPOINT UnsafePoint)
 {
-  PDC      dc = NULL;
+  PDC      dc;
   NTSTATUS Status = STATUS_SUCCESS;
 
   dc = DC_LockDc ( hDC );
@@ -569,7 +569,7 @@ NtGdiOffsetWindowOrgEx(HDC  hDC,
                       int  YOffset,
                       LPPOINT  Point)
 {
-  PDC dc = NULL;
+  PDC dc;
 
   dc = DC_LockDc(hDC);
   if (!dc)
@@ -758,7 +758,7 @@ NtGdiSetViewportExtEx(HDC  hDC,
                       int  YExtent,
                       LPSIZE  Size)
 {
-  PDC dc = NULL;
+  PDC dc;
 
   dc = DC_LockDc(hDC);
   if ( !dc )
@@ -830,7 +830,7 @@ NtGdiSetViewportOrgEx(HDC  hDC,
                      int  Y,
                      LPPOINT  Point)
 {
-  PDC dc = NULL;
+  PDC dc;
 
   dc = DC_LockDc(hDC);
   if (!dc)
@@ -881,7 +881,7 @@ NtGdiSetWindowExtEx(HDC  hDC,
                    int  YExtent,
                    LPSIZE  Size)
 {
-  PDC dc = NULL;
+  PDC dc;
 
   dc = DC_LockDc(hDC);
   if (!dc)
@@ -944,7 +944,7 @@ NtGdiSetWindowOrgEx(HDC  hDC,
                    int  Y,
                    LPPOINT  Point)
 {
-  PDC dc = NULL;
+  PDC dc;
 
   dc = DC_LockDc(hDC);
   if (!dc)
@@ -993,7 +993,7 @@ STDCALL
 NtGdiSetWorldTransform(HDC  hDC,
                       CONST LPXFORM  XForm)
 {
-  PDC  dc = NULL;
+  PDC  dc;
   NTSTATUS Status = STATUS_SUCCESS;
 
   dc = DC_LockDc (hDC);
diff --git a/reactos/subsystems/win32/win32k/objects/dc.c b/reactos/subsystems/win32/win32k/objects/dc.c
index 2935d58eee8..6f1c302d68f 100644
--- a/reactos/subsystems/win32/win32k/objects/dc.c
+++ b/reactos/subsystems/win32/win32k/objects/dc.c
@@ -1249,8 +1249,8 @@ IntGdiGetDCOrgEx(DC *dc, LPPOINT  Point)
 BOOL STDCALL
 NtGdiGetDCOrgEx(HDC  hDC, LPPOINT  Point)
 {
-  BOOL Ret = FALSE;
-  DC *dc = NULL;
+  BOOL Ret;
+  DC *dc;
   POINT SafePoint;
   NTSTATUS Status = STATUS_SUCCESS;
 
@@ -1812,7 +1812,7 @@ INT STDCALL
 NtGdiGetObject(HANDLE handle, INT count, LPVOID buffer)
 {
   INT Ret = 0;
-  LPVOID SafeBuf = NULL;
+  LPVOID SafeBuf;
   NTSTATUS Status = STATUS_SUCCESS;
   INT RetCount = 0;
 
diff --git a/reactos/subsystems/win32/win32k/objects/dibobj.c b/reactos/subsystems/win32/win32k/objects/dibobj.c
index 0cd65ee65bd..c638e27f911 100644
--- a/reactos/subsystems/win32/win32k/objects/dibobj.c
+++ b/reactos/subsystems/win32/win32k/objects/dibobj.c
@@ -27,9 +27,9 @@
 UINT STDCALL
 NtGdiSetDIBColorTable(HDC hDC, UINT StartIndex, UINT Entries, CONST RGBQUAD *Colors)
 {
-   PDC dc = NULL;
-   PBITMAPOBJ BitmapObj = NULL;
-   PPALGDI PalGDI = NULL;
+   PDC dc;
+   PBITMAPOBJ BitmapObj;
+   PPALGDI PalGDI;
    UINT Index;
 
    if (!(dc = DC_LockDc(hDC))) return 0;
@@ -92,9 +92,9 @@ NtGdiSetDIBColorTable(HDC hDC, UINT StartIndex, UINT Entries, CONST RGBQUAD *Col
 UINT STDCALL
 NtGdiGetDIBColorTable(HDC hDC, UINT StartIndex, UINT Entries, RGBQUAD *Colors)
 {
-   PDC dc = NULL;
-   PBITMAPOBJ BitmapObj = NULL;
-   PPALGDI PalGDI = NULL;
+   PDC dc;
+   PBITMAPOBJ BitmapObj;
+   PPALGDI PalGDI;
    UINT Index;
 
    if (!(dc = DC_LockDc(hDC))) return 0;
diff --git a/reactos/subsystems/win32/win32k/objects/fillshap.c b/reactos/subsystems/win32/win32k/objects/fillshap.c
index 759157211f7..a8964bb668a 100644
--- a/reactos/subsystems/win32/win32k/objects/fillshap.c
+++ b/reactos/subsystems/win32/win32k/objects/fillshap.c
@@ -827,8 +827,8 @@ NtGdiPolygon(HDC          hDC,
              CONST PPOINT UnsafePoints,
              int          Count)
 {
-  DC *dc = NULL;
-  LPPOINT Safept = NULL;
+  DC *dc;
+  LPPOINT Safept;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret = FALSE;
 
@@ -906,9 +906,9 @@ NtGdiPolyPolygon(HDC           hDC,
                  CONST LPINT   PolyCounts,
                  int           Count)
 {
-  DC *dc = NULL;
-  LPPOINT Safept = NULL;
-  LPINT SafePolyPoints = NULL;
+  DC *dc;
+  LPPOINT Safept;
+  LPINT SafePolyPoints;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret;
 
@@ -1559,11 +1559,11 @@ NtGdiGradientFill(
   ULONG uMesh,
   ULONG ulMode)
 {
-  DC *dc = NULL;
+  DC *dc;
   BOOL Ret;
-  PTRIVERTEX SafeVertex = NULL;
-  PVOID SafeMesh = NULL;
-  ULONG SizeMesh = 0;
+  PTRIVERTEX SafeVertex;
+  PVOID SafeMesh;
+  ULONG SizeMesh;
   NTSTATUS Status = STATUS_SUCCESS;
 
   dc = DC_LockDc(hdc);
diff --git a/reactos/subsystems/win32/win32k/objects/line.c b/reactos/subsystems/win32/win32k/objects/line.c
index c300b6cbdb3..2214ee90d5b 100644
--- a/reactos/subsystems/win32/win32k/objects/line.c
+++ b/reactos/subsystems/win32/win32k/objects/line.c
@@ -501,7 +501,7 @@ NtGdiMoveToEx(HDC      hDC,
              int      Y,
              LPPOINT  Point)
 {
-  DC *dc = NULL;
+  DC *dc;
   POINT SafePoint;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret;
@@ -554,8 +554,8 @@ NtGdiPolyBezier(HDC           hDC,
                CONST LPPOINT  pt,
                DWORD          Count)
 {
-  DC *dc = NULL;
-  LPPOINT Safept = NULL;
+  DC *dc;
+  LPPOINT Safept;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret;
 
@@ -642,8 +642,8 @@ NtGdiPolyBezierTo(HDC  hDC,
                  CONST LPPOINT  pt,
                  DWORD  Count)
 {
-  DC *dc = NULL;
-  LPPOINT Safept = NULL;
+  DC *dc;
+  LPPOINT Safept;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret;
 
@@ -732,7 +732,7 @@ NtGdiPolyDraw(
     IN LPBYTE lpbTypes,
     IN ULONG cCount)
 {
-    PDC dc = NULL;
+    PDC dc;
     BOOL result = FALSE;
     POINT lastmove;
     unsigned int i;
@@ -806,8 +806,8 @@ NtGdiPolyline(HDC            hDC,
              CONST LPPOINT  pt,
              int            Count)
 {
-  DC *dc = NULL;
-  LPPOINT Safept = NULL;
+  DC *dc;
+  LPPOINT Safept;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret;
 
@@ -894,8 +894,8 @@ NtGdiPolylineTo(HDC            hDC,
                CONST LPPOINT  pt,
                DWORD          Count)
 {
-  DC *dc = NULL;
-  LPPOINT Safept = NULL;
+  DC *dc;
+  LPPOINT Safept;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret;
 
@@ -983,9 +983,9 @@ NtGdiPolyPolyline(HDC            hDC,
                  CONST LPDWORD  PolyPoints,
                  DWORD          Count)
 {
-  DC *dc = NULL;
-  LPPOINT Safept = NULL;
-  LPDWORD SafePolyPoints = NULL;
+  DC *dc;
+  LPPOINT Safept;
+  LPDWORD SafePolyPoints;
   NTSTATUS Status = STATUS_SUCCESS;
   BOOL Ret;
 
diff --git a/reactos/subsystems/win32/win32k/objects/print.c b/reactos/subsystems/win32/win32k/objects/print.c
index fb05d265970..4ba7d2a715a 100644
--- a/reactos/subsystems/win32/win32k/objects/print.c
+++ b/reactos/subsystems/win32/win32k/objects/print.c
@@ -160,7 +160,7 @@ NtGdiExtEscape(
    LPVOID   SafeInData = NULL;
    LPVOID   SafeOutData = NULL;
    NTSTATUS Status = STATUS_SUCCESS;
-   INT      Result = 0;
+   INT      Result;
 
    if ( pDC == NULL )
    {
diff --git a/reactos/subsystems/win32/win32k/objects/rect.c b/reactos/subsystems/win32/win32k/objects/rect.c
index 10193d75a59..28d6925a601 100644
--- a/reactos/subsystems/win32/win32k/objects/rect.c
+++ b/reactos/subsystems/win32/win32k/objects/rect.c
@@ -188,7 +188,7 @@ NtGdiUnionRect(PRECT UnsafeDest, const RECT* UnsafeSrc1, const RECT* UnsafeSrc2)
 {
     RECT Dest, Src1 = {0}, Src2 = {0};
   NTSTATUS Status = STATUS_SUCCESS;
-  BOOL Ret = FALSE;
+  BOOL Ret;
 
   _SEH_TRY
   {
@@ -300,7 +300,7 @@ NtGdiIntersectRect(PRECT UnsafeDest, const RECT* UnsafeSrc1, const RECT* UnsafeS
 {
   RECT Dest, Src1, Src2 = {0};
   NTSTATUS Status = STATUS_SUCCESS;
-  BOOL Ret = FALSE;
+  BOOL Ret;
 
   _SEH_TRY
   {
diff --git a/reactos/subsystems/win32/win32k/objects/region.c b/reactos/subsystems/win32/win32k/objects/region.c
index 595c07471cc..64460ca7fde 100644
--- a/reactos/subsystems/win32/win32k/objects/region.c
+++ b/reactos/subsystems/win32/win32k/objects/region.c
@@ -2253,8 +2253,8 @@ NtGdiExtCreateRegion(OPTIONAL LPXFORM Xform,
                           DWORD Count,
                           LPRGNDATA RgnData)
 {
-   HRGN hRgn = 0;
-   PROSRGNDATA Region = NULL;
+   HRGN hRgn;
+   PROSRGNDATA Region;
    DWORD nCount = 0;
    NTSTATUS Status = STATUS_SUCCESS;
 
@@ -2404,7 +2404,7 @@ NtGdiGetRgnBox(HRGN  hRgn,
 {
   PROSRGNDATA  Rgn;
   RECT SafeRect;
-  DWORD ret = 0;
+  DWORD ret;
   NTSTATUS Status = STATUS_SUCCESS;
 
   if (!(Rgn = RGNDATA_LockRgn(hRgn)))
@@ -2637,7 +2637,7 @@ STDCALL
 NtGdiRectInRegion(HRGN  hRgn,
                        CONST LPRECT  unsaferc)
 {
-  PROSRGNDATA Rgn = NULL;
+  PROSRGNDATA Rgn;
   RECT rc = {0};
   BOOL Ret;
   NTSTATUS Status = STATUS_SUCCESS;
@@ -2713,7 +2713,7 @@ HRGN STDCALL
 NtGdiUnionRectWithRgn(HRGN hDest, CONST PRECT UnsafeRect)
 {
   RECT SafeRect;
-  PROSRGNDATA Rgn = NULL;
+  PROSRGNDATA Rgn;
   NTSTATUS Status = STATUS_SUCCESS;
 
   if(!(Rgn = (PROSRGNDATA)RGNDATA_LockRgn(hDest)))
@@ -2759,7 +2759,7 @@ NtGdiUnionRectWithRgn(HRGN hDest, CONST PRECT UnsafeRect)
  */
 DWORD STDCALL NtGdiGetRegionData(HRGN hrgn, DWORD count, LPRGNDATA rgndata)
 {
-    DWORD size = 0;
+    DWORD size;
     PROSRGNDATA obj = RGNDATA_LockRgn( hrgn );
     NTSTATUS Status = STATUS_SUCCESS;
 
@@ -3399,7 +3399,7 @@ NtGdiCreatePolygonRgn(CONST PPOINT  pt,
                       INT  Count,
                       INT  PolyFillMode)
 {
-   POINT *SafePoints = NULL;
+   POINT *SafePoints;
    NTSTATUS Status = STATUS_SUCCESS;
    HRGN hRgn;
 
@@ -3495,9 +3495,9 @@ NtGdiCreatePolyPolygonRgn(CONST PPOINT  pt,
                           INT  Count,
                           INT  PolyFillMode)
 {
-   POINT *Safept = NULL;
-   INT *SafePolyCounts = NULL;
-   INT nPoints = 0, nEmpty, nInvalid, i;
+   POINT *Safept;
+   INT *SafePolyCounts;
+   INT nPoints, nEmpty, nInvalid, i;
    HRGN hRgn;
    NTSTATUS Status = STATUS_SUCCESS;