Two fixes:

1. Make the list of ast_dial_channels a lockable list. This is because in some cases,
   the ast_dial may exist in multiple threads due to asynchronous execution of its application, and
   I found some cases where race conditions could exist.

2. Check in ast_dial_join to be sure that the channel still exists before attempting to lock it, since
   it could have gotten hung up but the is_running_app flag on the ast_dial_channel may not have been
   cleared yet.

(closes issue #12038)
Reported by: jvandal
Patches:
      12038v2.patch uploaded by putnopvut (license 60)
Tested by: jvandal



git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@104841 f38db490-d61c-443f-a65b-d21fe96a405b

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