cdr.c: Add missing aow_unlock(cdr) in off nominal path of handle_dial_message().

* Trivial common code hoisting in handle_bridge_leave_message().

* Some whitespace fixing.
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Merged revisions 410541 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@410542 f38db490-d61c-443f-a65b-d21fe96a405b