Defect 501.

Fix some mutex and error return problems.

BKrev: 4266d40eIENsfJQEvDM6MjMDhFcqLA


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@616 fd59a12c-fef9-0310-b244-a6a79926bd2f