net: x25: Use list_for_each_entry() to simplify code in x25_link.c

Convert list_for_each() to list_for_each_entry() where
applicable. This simplifies the code.

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Wang Hai <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/x25/x25_link.c

···
 struct x25_neigh *x25_get_neigh(struct net_device *dev)
 {
 	struct x25_neigh *nb, *use = NULL;
-	struct list_head *entry;
 
 	read_lock_bh(&x25_neigh_list_lock);
-	list_for_each(entry, &x25_neigh_list) {
-		nb = list_entry(entry, struct x25_neigh, node);
-
+	list_for_each_entry(nb, &x25_neigh_list, node) {
 		if (nb->dev == dev) {
 			use = nb;
 			break;