[USBEHCI]

- Remove assertion which no longer holds
- Delete old queue head after a new queue head has been sucessfully fetched 

svn path=/trunk/; revision=55691

reactos/drivers/usb/usbehci/usb_queue.cpp

@@ -769,16 +769,16 @@ CUSBQueue::QueueHeadCleanup(
     //
     if ((Request->IsRequestComplete() == FALSE) && (UrbStatus == USBD_STATUS_SUCCESS))
     {
-        //
-        // let IUSBRequest free the queue head
-        //
-        Request->FreeQueueHead(CurrentQH);
-
         //
         // request is incomplete, get new queue head
         //
         if (Request->GetQueueHead(&NewQueueHead) == STATUS_SUCCESS)
         {
+            //
+            // let IUSBRequest free the queue head
+            //
+            Request->FreeQueueHead(CurrentQH);
+
             //
             // first acquire request lock
             //

reactos/drivers/usb/usbehci/usb_request.cpp

@@ -732,7 +732,6 @@ CUSBRequest::InitDescriptor(
     *OutDescriptorLength = Length;
 }
 
-
 NTSTATUS
 CUSBRequest::BuildTransferDescriptorChain(
     IN PQUEUE_HEAD QueueHead,
@@ -1192,11 +1191,6 @@ CUSBRequest::BuildBulkTransferQueueHead(
                                           &m_EndpointDescriptor->DataToggle,
                                           &ChainDescriptorLength);
 
-    //
-    // FIXME: handle errors
-    //
-    //ASSERT(ChainDescriptorLength == m_TransferBufferLength);
-
     //
     // move to next offset
     //