zebra: fix VRF code for *BSD

There seems to be no rtm_table in struct rt_msghdr, at least on the
systems I have access to...

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index bdfb148..374ca41 100644
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -962,7 +962,7 @@
           || rtm->rtm_type == RTM_ADD
           || rtm->rtm_type == RTM_CHANGE)
         rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p, &gate.sin.sin_addr,
-                      NULL, 0, VRF_DEFAULT, rtm->rtm_table, 0, 0, SAFI_UNICAST);
+                      NULL, 0, VRF_DEFAULT, 0, 0, 0, SAFI_UNICAST);
       else
         rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, &p,
                          &gate.sin.sin_addr, 0, VRF_DEFAULT, SAFI_UNICAST);