manager: Originate doesn't abort on failed format_cap allocation

action_originate responds to the remote system with an error when cap==NULL,
but doesn't return (abort the originate).  Patched to return.

(closes issue ASTERISK-23034)
Reported by: Corey Farrell
Patches:
     ASTERISK-23034.patch uploaded by coreyfarrell (license 5909)
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Merged revisions 405745 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 405746 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@405747 65c4cc65-6c06-0410-ace0-fbb531ad65f3