Merged revision 291504 from

Merged revision 291504 from
https://origsvn.digium.com/svn/asterisk/be/branches/C.3-bier

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  r291504 | rmudgett | 2010-10-13 13:30:21 -0500 (Wed, 13 Oct 2010) | 11 lines

  Hold off ast_hangup() from destroying the ast_channel.

  Must get the ast_channel lock before proceeding with release_chan() and
  release_chan_early() to hold off ast_hangup() from destroying the
  ast_channel.

  Missed this change for -r291468.

  JIRA ABE-2598
  JIRA SWP-2317
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@291507 65c4cc65-6c06-0410-ace0-fbb531ad65f3