clm.c:
defect 600
Qian Zhang reported defect 599 which was a missing
pthread_mutex_unlock. Patch attached to fix it.

BKrev: 42a4b379jtJP5rnRmyVL92o1PyIDDw


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@655 fd59a12c-fef9-0310-b244-a6a79926bd2f