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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Merged revisions 375362 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 375363 from http://svn.asterisk.org/svn/asterisk/branches/11
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@375364
65c4cc65-6c06-0410-ace0-
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