Revert "h264: clear trailing bits in partially parsed NAL units"

This reverts commit 729ebb2f185244b0ff06d48edbbbbb02ceb4ed4e.

There was an off-by-one error in the bit mask calculation clearing
actually the last valid bit and causing
http://bugzilla.libav.org/show_bug.cgi?id=227

The broken sample (Mr_MrsSmith-h264_aac.mp4) the commit was fixing
does not work after correcting the off-by-one error.

CC: libav-stable@libav.org
