Backport floo0 out-of-bounds write fix from main branch
Backports commit 80661a13 from tremor main branch: floor0 code could potentially use a book where the number of vals it needed to decode was not an integer number of dims wide. This caused it to overflow the output vector as the termination condition was in the outer loop of vorbis_book_decodev_set. None of the various vorbis_book_decodeXXXX calls internally guard against this case either, but in every other use the calling code does properly guard (and avoids putting more checks in the tight inner decode loop). For floor0, move the checks into the inner loop as there's little penalty for doing so. Add commentary indicating where guarding is done for each call variant.
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