fix unchecked length in stb_vorbis that could crash on corrupt/invalid files
float stb_vorbis_stream_length_in_seconds(stb_vorbis *f)
{
   return stb_vorbis_stream_length_in_samples(f) / (float) f->sample_rate;
}

float stb_vorbis_stream_length_in_seconds(stb_vorbis *f)
{
   return stb_vorbis_stream_length_in_samples(f) / (float) f->sample_rate;
}
