fix bug: move flac decoder teardown into EncoderSession_destroy()
fix bug: move flac decoder teardown into EncoderSession_destroy()

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