Fix the ogg regression test, which was broken by r18092. This is an

expected change because the ogg muxer with FLAC encoder uses the maximum
frame size estimate since it cannot rewrite the real maximum frame size
at end of encoding.

Originally committed as revision 18094 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/libav.regression.ref

@@ -97,7 +97,7 @@ ae3a23a7ea13c92a2909445ca8144dcd *./tests/data/b-libav.aif
 8d117c49d6b210abe783d1b0b897cec7 *./tests/data/b-libav.voc
 32768 ./tests/data/b-libav.voc
 ./tests/data/b-libav.voc CRC=0x49972c8c
-9268c90bd2623a5ab3c2a1a751826f69 *./tests/data/b-libav.ogg
+767a75e9abf9754bfdc880d6faed69cf *./tests/data/b-libav.ogg
 14210 ./tests/data/b-libav.ogg
 ./tests/data/b-libav.ogg CRC=0x37a143ea
 52bb2f530036c657edc512965258d735 *./tests/data/b-libav-yuv420p.yuv