Reading past the end of a buffer is bad, Even if the

Reading past the end of a buffer is bad, Even if the
extra byte is always there. Even if the byte contains
innocuous data that isn't used. Eeven if a particular
level of optimization of a particular compiler avoids
it by processing things backwards. Bad.

So simplify and correct logic. Perhaps even proof the
code against future generations of clever compilers.

Pointed out by Brandon Falk. Thanks!

ok millert@ tb@