[sdlsound] AIFF decoder bug

[Ryan C. Gordon]

> Unfortunately, when I use Frank's audio converter the test script crashes
> on the very first test case, and so far I don't have a clue why. What's so
> annoying is that if I use electric fence, it doesn't crash. Can anyone else
> reproduce this? Any ideas?

Hmm...could be heap corruption, since malloc and efence will store their
info differently.

I'll take a look.

--ryan.