Do not dereference NULL pointers and this time for real.

Modified: trunk/reactos/subsys/win32k/ntuser/winpos.c

--- trunk/reactos/subsys/win32k/ntuser/winpos.c	2005-07-26 22:40:03 UTC (rev 16763)
+++ trunk/reactos/subsys/win32k/ntuser/winpos.c	2005-07-26 22:51:03 UTC (rev 16764)
@@ -164,7 +164,7 @@

 
 done:
   Fg = NtUserGetForegroundWindow();

-  if (!Fg || Window->Self == Fg)

+  if (Wnd && (!Fg || Window->Self == Fg))

   {
     if (IntSetForegroundWindow(Wnd))
     {