indicate when streaming an audio file fails like it is done in other parts
of the code to indicate an error.

Note was requested by Paul Belanger: 
http://lists.digium.com/pipermail/asterisk-dev/2013-July/061420.html

(related to issue ASTERISK-21903)
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Merged revisions 396196 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 396197 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@396198 65c4cc65-6c06-0410-ace0-fbb531ad65f3