`sockaddr_in6' address when sizeof(struct sockaddr_in6) >
sizeof(struct sockaddr) and we have no sa_len to tell us how large the
address is. This obviously doesn't work with unknown protocol types.
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@6514 ec53bebd-3082-4978-b11e-865c3cabbd6b