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 <weiyj.lk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6287a8b..ab3e796 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3624,8 +3624,7 @@
 			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);