app_chanspy, channel: fix frame leaks

Fixed a couple of frame leaks that were found during testing.

ASTERISK-24828 #close
Reported by: John Hardin
Review: https://reviewboard.asterisk.org/r/4445/
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Merged revisions 432362 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 432363 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@432364 65c4cc65-6c06-0410-ace0-fbb531ad65f3