Merged revisions 334355 via svnmerge from

Merged revisions 334355 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r334355 | rmudgett | 2011-09-02 15:59:49 -0500 (Fri, 02 Sep 2011) | 19 lines

  MusicOnHold has extra unref which may lead to memory corruption and crash.

  The problem happens when a call is disconnected and you had started a MOH
  class that does not use the files mode.  If you define REF_DEBUG and
  recreate the problem, it will announce itself with the following warning:
  Attempt to unref mohclass 0xb70722e0 (default) when only 1 ref remained,
  and class is still in a container!

  * Fixed moh_alloc() and moh_release() functions not handling the
  state->class reference consistently.

  (closes issue ASTERISK-18346)
  Reported by: Mark Murawski
  Patches:
        jira_asterisk_18346_v1.8.patch (license #5621) patch uploaded by rmudgett
  Tested by: rmudgett, Mark Murawski

  Review: https://reviewboard.asterisk.org/r/1404/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@334357 65c4cc65-6c06-0410-ace0-fbb531ad65f3