[gvg] 17922: Set correct error code, IsWindow() depends on this

Set correct error code, IsWindow() depends on this
Modified: trunk/reactos/subsys/win32k/ntuser/window.c
  _____  

Modified: trunk/reactos/subsys/win32k/ntuser/window.c
--- trunk/reactos/subsys/win32k/ntuser/window.c	2005-09-18 18:59:59 UTC
(rev 17921)
+++ trunk/reactos/subsys/win32k/ntuser/window.c	2005-09-18 21:48:56 UTC
(rev 17922)
@@ -3233,6 +3233,7 @@

 
    if (!(Window = UserGetWindowObject(hWnd)))
    {
+      SetLastWin32Error(ERROR_INVALID_WINDOW_HANDLE);
       return 0;
    }