Fix for bug 577; used a different approach than the submitted patch
(rather than fudging an out of bound result after computation, do it the right way to begin with) Add test for fix to seeking_example. svn path=/trunk/vorbis/; revision=13198
(rather than fudging an out of bound result after computation, do it the right way to begin with) Add test for fix to seeking_example. svn path=/trunk/vorbis/; revision=13198