Merged revisions 103786 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r103786 | mmichelson | 2008-02-18 14:52:09 -0600 (Mon, 18 Feb 2008) | 10 lines

There was an invalid assumption when calculating the duration of a file that the filestream in question
was created properly. Unfortunately this led to a segfault in the situation where an unknown format was
specified in voicemail.conf and a voicemail was recorded. Now, we first check to be sure that the stream
was written correctly or else assume a zero duration.

(closes issue #12021)
Reported by: jakep
Tested by: putnopvut


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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@103787 65c4cc65-6c06-0410-ace0-fbb531ad65f3