net: ipv6: use list_move instead of list_del/list_add

Using list_move() instead of list_del() + list_add().

Signed-off-by: Wei Yongjun <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv6/addrconf.c

···
 			state = ifa->state;
 			ifa->state = INET6_IFADDR_STATE_DEAD;
 
-			list_del(&ifa->if_list);
-			list_add(&ifa->if_list, &del_list);
+			list_move(&ifa->if_list, &del_list);
 		}
 
 		spin_unlock_bh(&ifa->lock);