Backported from X.org:

   commit 5e106a71b9f8077216d41619402952b0005dd8a4
   Author: Adam Jackson <ajax@nwnk.net>
   Date:   Wed Mar 15 16:49:04 2006 +0000

   Coverity # 807: Fix a memory leak in XFixesExpandRegion.
Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>

Fixes ArcticaProject/nx-libs#541