Remove an unneccessary unlock and do away with the error msg about not being...

 Remove an unneccessary unlock and do away with the error msg about not being able to unlock the lock. #6201 



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@8020 65c4cc65-6c06-0410-ace0-fbb531ad65f3