Timothy B. Terriberry authored Dec 16, 2010 and Jean-Marc Valin committed Dec 16, 2010

Commit 8e447678 increased the number of cases where we end skipping
 without explicit signaling.
Before, this would cause the bit we reserved for this purpose to
 either a) get grabbed by some N=1 band to code its sign bits or
 b) wind up as part of the fine energy at the end.
This patch gives it back to the band where we stopped skipping,
 which is either the first band, or a band that was boosted by
 dynalloc.
This allows the bit to be used for shape coding in that band, and
 allows the better computation of the fine offset, since the band
 knows it will get that bit in advance.

With this change, we now guarantee that the number of bits allocated
 by compute_allocation() is exactly equal to the input total, less
 the bits consumed by skip flags during allocation itself (assuming
 total was non-negative; for negative total, no bits are emitted,
 and no bits are allocated).