[greatlrd] 20424: PALETTE_SetMapping do not write the palette color to NULL pointer.

PALETTE_SetMapping do not write the palette color to NULL pointer.
Modified: trunk/reactos/subsys/win32k/objects/palette.c
  _____  

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;