fix bug in SIOCAIFADDR_IN6 (p2p) case, when ifindex is filled with invalid value.  some cosmetics.
fix bug in SIOCAIFADDR_IN6 (p2p) case, when ifindex is filled with
invalid value.  some cosmetics.

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