Fix to make sure we don't hangup a call when getting a RLC without sending...

Fix to make sure we don't hangup a call when getting a RLC without sending REL.  Found making sure we are Q.784 (the SS7 test specification) compliant

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@82273 65c4cc65-6c06-0410-ace0-fbb531ad65f3