ov_read_float segfaults on oggflac streams
As ov_read doesn't check logical streams after the first, it's possible to feed ov_read_float a physical stream that contains a non-vorbis logical stream (such as ogg encapsulated flac). Rather than returning OV_EBADLINK, it will segfault. As ov_read_float and ov_read are similar, I expect the same applies for ov_read.
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