IntEngBitBlt() ASSERT() some assumptions

reactos/subsys/win32k/eng

diff -u -r1.62 -r1.63
--- bitblt.c	14 Dec 2004 03:23:14 -0000	1.62
+++ bitblt.c	14 Dec 2004 03:28:34 -0000	1.63
@@ -16,7 +16,7 @@

  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

-/* $Id: bitblt.c,v 1.62 2004/12/14 03:23:14 royce Exp $

+/* $Id: bitblt.c,v 1.63 2004/12/14 03:28:34 royce Exp $

  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel

@@ -496,10 +496,14 @@

   RECTL OutputRect;
   POINTL InputPoint;
   BOOLEAN UsesSource;

-  SURFOBJ *DestSurf = &DestObj->SurfObj;

+  SURFOBJ *DestSurf;

   SURFOBJ *SourceSurf = SourceObj ? &SourceObj->SurfObj : NULL;
   SURFOBJ *MaskSurf = MaskObj ? &MaskObj->SurfObj : NULL;
 

+  ASSERT(DestObj);
+  DestSurf = &DestObj->SurfObj;
+  ASSERT(DestSurf);
+

   InputClippedRect = *DestRect;
   if (InputClippedRect.right < InputClippedRect.left)
     {