[IPV4]: Use static in several places.

More functions and data that should be static.

net/ipv4/devinet.c

@@ -998,7 +998,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
 	return NOTIFY_DONE;
 }
 
-struct notifier_block ip_netdev_notifier = {
+static struct notifier_block ip_netdev_notifier = {
 	.notifier_call =inetdev_event,
 };
 

net/ipv4/tcp.c

@@ -753,9 +753,6 @@ static int wait_for_tcp_memory(struct sock *sk, long *timeo)
 	goto out;
 }
 
-ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset,
-			 size_t psize, int flags);
-
 static inline int can_coalesce(struct sk_buff *skb, int i, struct page *page,
 			       int off)
 {
@@ -836,7 +833,7 @@ static int tcp_error(struct sock *sk, int flags, int err)
 	return err;
 }
 
-ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset,
+static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset,
 			 size_t psize, int flags)
 {
 	struct tcp_opt *tp = tcp_sk(sk);

net/ipv4/tcp_input.c

@@ -1059,7 +1059,7 @@ void tcp_enter_frto(struct sock *sk)
  * which indicates that we should follow the traditional RTO recovery,
  * i.e. mark everything lost and do go-back-N retransmission.
  */
-void tcp_enter_frto_loss(struct sock *sk)
+static void tcp_enter_frto_loss(struct sock *sk)
 {
 	struct tcp_opt *tp = tcp_sk(sk);
 	struct sk_buff *skb;