bitmath.h : Minor improvements.
bitmath.h : Minor improvements.

This is part of a larger patch from lvqcl.

Patch-from: lvqcl <eea571d36fd4ab6d1b7846011ee3606fc46f6b58@gmail.com>

waitman/flac,waitman/flac,waitman/flac,fredericgermain/flac,waitman/flac,fredericgermain/flac,waitman/flac,fredericgermain/flac,fredericgermain/flac