waylandsink: Fix memory leak of shm allocator

This fixes conflict resolution error introduced in commit:

  816d115317c522c87297109de781c63b16146493

http://bugzilla.gnome.org/show_bug.cgi?id=790042

Change-Id: If76dc8ac330e07484df86d4ee5b95cde4464a9e2
1 file changed