Crash using OSS when trying to rewind html5 video

[Ilya A. Arhipov]

Crash using OSS when trying to rewind html5 video.

You can look here: https://bugzilla.mozilla.org/show_bug.cgi?id=605861
Also i create pr: http://www.freebsd.org/cgi/query-pr.cgi?pr=151728

Steps to Reproduce:
1. open http://fosscasts.com/screencasts/6-System-Monitoring-With-Monit
2. start html5 video
3. try to rewind... crash :(
Actual Results:  
bus error (core dump)

Patch in attach


Best regard.
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