Fix memory leaks
(closes issue ASTERISK-22368)
Reported by: Corey Farrell
Patches:
issueA22368_mixmonitor_free_filename.patch uploaded by wdoekes (license 5674)
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Merged revisions 398004 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 398011 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 398016 from http://svn.asterisk.org/svn/asterisk/branches/12
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@398017
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