Sound_DecodeAll() vs. FLAC decoder

[Ryan C. Gordon]

> Unfortunately I won't be able to test that until I get home. Apart from
> that, does it look reasonable to you?

I made a few tweaks (saves the previous, still-valid pointer if realloc()
fails), and added some other checks for robustness (makes sure EOF/error
flags aren't set before starting), but it's in CVS in some form or
another.   :)

--ryan.