Add NULl check for pointer.

Signed-off-by: li-elvin
Reviewed-by: lgao4, lzeng14


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12333 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/CapsulePei/Common/CapsuleCoalesce.c

@@ -541,6 +541,8 @@ GetCapsuleInfo (
   UINTN Count;
   UINTN Size;
 
+  ASSERT (Desc != NULL);
+
   Count = 0;
   Size  = 0;