simplify some of the fseek()ing code
simplify some of the fseek()ing code

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