Use the list_for_each_entry in nf_sockopt.c

index a5e5e30..87bc144 100644
@@ -23,14 +23,13 @@ static inline int overlap(int min1, int max1, int min2, int max2)
 /* Functions to register sockopt ranges (exclusive). */
 int nf_register_sockopt(struct nf_sockopt_ops *reg)
 {
-	struct list_head *i;
+	struct nf_sockopt_ops *ops;
 	int ret = 0;
 
 	if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0)
 		return -EINTR;
 
-	list_for_each(i, &nf_sockopts) {
-		struct nf_sockopt_ops *ops = (struct nf_sockopt_ops *)i;
+	list_for_each_entry(ops, &nf_sockopts, list) {
 		if (ops->pf == reg->pf
 		    && (overlap(ops->set_optmin, ops->set_optmax,
 				reg->set_optmin, reg->set_optmax)

@@ -64,7 +63,6 @@ EXPORT_SYMBOL(nf_unregister_sockopt);
 static struct nf_sockopt_ops *nf_sockopt_find(struct sock *sk, int pf,
 		int val, int get)
 {
-	struct list_head *i;
 	struct nf_sockopt_ops *ops;
 
 	if (sk->sk_net != &init_net)

@@ -73,8 +71,7 @@ static struct nf_sockopt_ops *nf_sockopt_find(struct sock *sk, int pf,
 	if (mutex_lock_interruptible(&nf_sockopt_mutex) != 0)
 		return ERR_PTR(-EINTR);
 
-	list_for_each(i, &nf_sockopts) {
-		ops = (struct nf_sockopt_ops *)i;
+	list_for_each_entry(ops, &nf_sockopts, list) {
 		if (ops->pf == pf) {
 			if (!try_module_get(ops->owner))
 				goto out_nosup;