Merged revisions 222298 via svnmerge from

Merged revisions 222298 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

........
  r222298 | jpeeler | 2009-10-06 14:24:59 -0500 (Tue, 06 Oct 2009) | 9 lines

  Fix crash during destruction of second channel when variable set with setvar.

  The setvar line in chan_dahdi.conf is shared among all the channels, so make
  sure to only free the resources only when the last channel is destroyed.

  (closes issue #15899)
  Reported by: tzafrir
........

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.0@222302 65c4cc65-6c06-0410-ace0-fbb531ad65f3