added a validation in mip6_global_addr() (we can't 100% asume that in6ifa_ifpforlinklocal() returns a non NULL value.)
added a validation in mip6_global_addr()
(we can't 100% asume that in6ifa_ifpforlinklocal() returns a non NULL value.)

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