fixed infinite loop by fixing DceFreeDCE() to update FirstDce if necessary.

reactos/subsys/win32k/ntuser

diff -u -r1.66.12.3 -r1.66.12.4
--- windc.c	14 Sep 2004 01:00:44 -0000	1.66.12.3
+++ windc.c	26 Sep 2004 15:19:33 -0000	1.66.12.4
@@ -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: windc.c,v 1.66.12.3 2004/09/14 01:00:44 weiden Exp $

+/* $Id: windc.c,v 1.66.12.4 2004/09/26 15:19:33 royce Exp $

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

@@ -601,6 +601,12 @@

 
   ret = dce->next;
 

+  if ( FirstDce == dce )
+  {
+    DPRINT1("DceFreeDCE() asked to delete FirstDce(0x%x), setting it to 0x%x\n", FirstDce, ret );
+    FirstDce = ret;
+  }
+

 #if 0 /* FIXME */
   SetDCHook(dce->hDC, NULL, 0L);
 #endif

@@ -676,6 +682,7 @@

 {
   while (FirstDce != NULL)
     {

+	  DPRINT1 ( "DceEmptyCache() calling DceFreeDCE(%x)\n", FirstDce);

       DceFreeDCE(FirstDce);
     }
 }