Various undefined behaviour fixes #786
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Fixes xiph#784 Co-authored-by: braheezy <11700503+braheezy@users.noreply.github.com>
As xiph#784 notified me of undefined behaviour going undetected by the fuzzers, I ran the test suite with the full undefined behaviour sanitizer enabled. There is one bit of undefined behaviour that I cannot fix, FLAC__metadata_get_picture allows a picture type of -1 to mean all, but this isn't part of the enum.
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Fixes #784