[NTOSKRNL] Don't dereference VACB when allocating its memory area fails

This avoids performing a double-free (even though that's hidden by the
fact we use lookaside allocations for VACB), and it avoids freeing
a memory address at an uninitialized address.
We don't care about references here, the VACB was just allocated, never
linked and we're its only user.

CORE-15413

ntoskrnl/cc/view.c

@@ -833,7 +833,6 @@ Retry:
             goto Retry;
         }
 
-        CcRosVacbDecRefCount(current);
         ExFreeToNPagedLookasideList(&VacbLookasideList, current);
         return Status;
     }