in6_update_ifa causes error even when plen == 128 if !FORCE_P2PPLEN. make it return an error only when FORCE_P2PLEN && plen != 128.
in6_update_ifa causes error even when plen == 128 if !FORCE_P2PPLEN.
make it return an error only when FORCE_P2PLEN && plen != 128.

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