Correctly end locally ended calls.

(closes issue #12170)
Reported by: pj
Patches:
      20080702__issue12170_clear_pendinginvite.diff uploaded by bbryant (license 36)
Tested by: bbryant, pabelanger


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@137532 65c4cc65-6c06-0410-ace0-fbb531ad65f3