Fix duration reporting for Theora streams.
ogginfo wasn't correcting for the granule position difference between 3.2.0 and 3.2.1 streams. It was always assuming the 3.2.1 behavior, but since this code hasn't been changed since 2005 and the 3.2.1 bitstream bump was done in 2007, it was simply wrong before. svn path=/trunk/vorbis-tools/; revision=18497
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