[SDK:CMLIB] HvGetCell is a macro calling the hive's GetCellRoutine callback.

In principle there should be different get-cell routines, depending
on the type of the hive (given by the OperationType parameter of
HvInitialize): for flat hives, memory-mapped hives, etc.
For now in ReactOS we only support a restricted subset of these,
therefore we are still happy with a single get-cell callback...
This may change in the future.

sdk/lib/cmlib/hiveinit.c

@@ -562,6 +562,11 @@ HvInitialize(
 #endif
     Hive->HiveFlags = HiveFlags & ~HIVE_NOLAZYFLUSH;
 
+    // TODO: The CellRoutines point to different callbacks
+    // depending on the OperationType.
+    Hive->GetCellRoutine = HvpGetCellData;
+    Hive->ReleaseCellRoutine = NULL;
+
     switch (OperationType)
     {
         case HINIT_CREATE: