[vorbis-dev] short block bug found

[Monty]

That one was a bit trickier than expected; a bug in max_seeds causes the
psychoacoustics for very short frames to discard bin 0 in masking, causing
residue dynamic range overload.  The bug triggers at about the same point the
frame size makes frame mismatches audible...

Just to avoid alarming anyone, the bug doesn't affect the bitstream format; the
encoder simply screws up the near-DC amplitude level.  I'm a bit burned out
tonight, a fix will get checked in tomorrow.

Monty

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