[MPlayer-dev-eng] [PATCH] fix vf scale with negative values

[RC]

This patch is to fix a problem when using scale with negative values.
 While scale=-1:-2 worked fine, scale=-2:-1 did not (though, according
to the man page, it should have).  

I've done a few minutes of testing with this patch, and it doesn't seem
to break anything, just fixes what was already broken.


For detailed info on the problem:
Message-Id: <20041021192318.1e3d36d5.rcooley at spamcop.net>
Subject: [MPlayer-users] Problem with 'scale' negative options.
http://thread.gmane.org/gmane.comp.video.mplayer.user/32703
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