MFC r191305:

MFC r191305:

 Back out r186308 (r191014 in stable/7):

 In case of AF_LINK, which the kernel still returns for an RTAX_GATEWAY
 as an empty sockaddr_dl in the classic tun<n> case:
 copying the address into the message payload, but not the RTA_GATEWAY
 flag results in rt_xaddrs() in the kernel tripping over that and parsing
 the next attribute set with a flag, i.e. RTA_NETMASK, with the gateway
 address, resulting in bogus route entry.

Approved by:  re (kensmith)

git-svn-id: svn://svn.freebsd.org/base/releng/7.2@191373 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f