fixed buffer overrun for IPv6 address array when len == 128.
fixed buffer overrun for IPv6 address array when len == 128.

Obtained from: freebsd-current
Reported by: Ted Unangst (via Colin Percival)

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame