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)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@405745 65c4cc65-6c06-0410-ace0-fbb531ad65f3