fixed uninitialized variable warning

Modified: trunk/reactos/ntoskrnl/ke/usercall.c

--- trunk/reactos/ntoskrnl/ke/usercall.c	2006-01-12 00:11:14 UTC (rev 20795)
+++ trunk/reactos/ntoskrnl/ke/usercall.c	2006-01-12 00:13:45 UTC (rev 20796)
@@ -40,7 +40,7 @@

 {
     ULONG_PTR NewStack, OldStack;
     PULONG UserEsp;

-    NTSTATUS CallbackStatus;

+    NTSTATUS CallbackStatus = STATUS_SUCCESS;

     PEXCEPTION_REGISTRATION_RECORD ExceptionList;
     DPRINT("KeUserModeCallback(RoutineIndex %d, Argument %X, ArgumentLength %d)\n",
             RoutineIndex, Argument, ArgumentLength);