PALETTE_SetMapping do not write the palette color to NULL pointer.

Modified: trunk/reactos/subsys/win32k/objects/palette.c

--- trunk/reactos/subsys/win32k/objects/palette.c	2005-12-29 14:00:12 UTC (rev 20423)
+++ trunk/reactos/subsys/win32k/objects/palette.c	2005-12-29 14:15:36 UTC (rev 20424)
@@ -329,7 +329,10 @@

         }
 
         if( !prevMapping || palPtr->mapping[uStart] != index ) iRemapped++;

-        palPtr->mapping[uStart] = index;

+        if (palPtr->mapping != NULL)            
+        {
+            palPtr->mapping[uStart] = index;
+        }

 
   }
   return iRemapped;