Merged revisions 375362 via svnmerge from

Merged revisions 375362 via svnmerge from
file:///srv/subversion/repos/asterisk/branches/10

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  r375362 | rmudgett | 2012-10-29 10:51:24 -0500 (Mon, 29 Oct 2012) | 15 lines

  chan_dahdi: Fix segfault dereferencing a NULL tech_pvt.

  The tech support customer was using the AMI Redirect action shortly after
  a call was placed.  While the channel tried to do an ast_read(), the
  masquerade resulting from the channel redirect took place.  The masquerade
  in the middle of the ast_read() resulted in the segfault.

  (closes issue AST-1025)
  Reported by: Trey Blancher
  Patches:
        jira_ast_1025_v1.8_v2.patch (license #5621) patch uploaded by rmudgett
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  Merged revisions 375361 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10-digiumphones@375387 65c4cc65-6c06-0410-ace0-fbb531ad65f3