[greatlrd] 20078: bugfix a bsod in DD_Cleanup

bugfix a bsod in DD_Cleanup
Modified: trunk/reactos/subsys/win32k/ntddraw/ddraw.c
  _____

Modified: trunk/reactos/subsys/win32k/ntddraw/ddraw.c
--- trunk/reactos/subsys/win32k/ntddraw/ddraw.c	2005-12-11 19:36:43 UTC
(rev 20077)
+++ trunk/reactos/subsys/win32k/ntddraw/ddraw.c	2005-12-11 19:42:08 UTC
(rev 20078)
@@ -19,16 +19,19 @@

BOOL INTERNAL_CALL
 DD_Cleanup(PVOID ObjectBody)
-{
-    if (ObjectBody == NULL)
-        return FALSE;
-        
+{       
    PDD_DIRECTDRAW pDirectDraw = (PDD_DIRECTDRAW) ObjectBody;
    DPRINT1("DD_Cleanup\n");
    
    if (!pDirectDraw)
    	return FALSE;
-
+    
+    if (pDirectDraw->Global.dhpdev == NULL)
+        return FALSE;
+        
+    if (pDirectDraw->DrvDisableDirectDraw == NULL)
+        return FALSE;
+        
    pDirectDraw->DrvDisableDirectDraw(pDirectDraw->Global.dhpdev);
    return TRUE;
 }