remove the commented-out and erroneous end-of-stream setting in read_callback_(); fix another bug in seeking where landing after the last frame start would cause a seek error; improve the infinite-loop checker
remove the commented-out and erroneous end-of-stream setting in read_callback_(); fix another bug in seeking where landing after the last frame start would cause a seek error; improve the infinite-loop checker

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