sit: set name of device back to struct parms

addrconf_set_sit_dstaddr will use parms->name.
Signed-off-by: zhang kai <zhangkaiheb@126.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/sit.c

@@ -271,6 +271,9 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
 	if (ipip6_tunnel_create(dev) < 0)
 		goto failed_free;
 
+	if (!parms->name[0])
+		strcpy(parms->name, dev->name);
+
 	return nt;
 
 failed_free: