fix bug where metaflac was getting the wrong offset for seek points
fix bug where metaflac was getting the wrong offset for seek points

fredericgermain/flac,Distrotech/flac,LordJZ/libflac,Distrotech/flac,waitman/flac,waitman/flac,kode54/flac,fredericgermain/flac,waitman/flac,fredericgermain/flac,Distrotech/flac,waitman/flac,kode54/flac,fredericgermain/flac,Distrotech/flac,LordJZ/libflac,waitman/flac,LordJZ/libflac,kode54/flac,LordJZ/libflac,kode54/flac