Fix two node cluster membership event not appearing on leave problem
reported by Chris Friesen.

BKrev: 40e477d75L2YauKHr18UGUlPGfAEoA


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@47 fd59a12c-fef9-0310-b244-a6a79926bd2f