app_confbridge: Fix ref leak in CLI "confbridge kick" command.

Fixed ref leak in the CLI "confbridge kick" command when the channel to be
kicked was not in the conference.
........

Merged revisions 413451 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@413452 f38db490-d61c-443f-a65b-d21fe96a405b
app_confbridge: Fixed "CBAnn" channels not going away.

Fixed a ref leak in conf_handle_talker_cb() everytime the conference
bridge was found to report a channel's talker status change.  The
resulting leak caused the "CBAnn" channels and the conference bridge to
never be destroyed.

Thanks to Richard Kenner on the asterisk-user's list for locating the
problem.

Reported by: Richard Kenner


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@413454 f38db490-d61c-443f-a65b-d21fe96a405b