[CELT-dev] Celt allocation bugfix

[Gregory Maxwell]

In some conditions (sample rate, frame size, bytes per frame, audio
data) the CELT allocator may run out of bits and attempt to place a
negative number of pulses in a band. This causes an array underrun and
other assorted nastyness. Patch attached.  (It should also apply
cleanly to 0.5.0 which is also impacted by this bug).
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