Fix a memory violation in objdb (caught by valgrind)
If the new length is larger then memory will be overwritten.
I could make this ">=" but we can save memory if the new size is smaller by using "!=".
git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@1680 fd59a12c-fef9-0310-b244-a6a79926bd2f