net: ping: make local functions static

As these functions are only used in this file.
Signed-off-by: NChangli Gao <xiaosuo@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ping.c

@@ -449,7 +449,7 @@ static int ping_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, st
 	return ip_push_pending_frames(sk, fl4);
 }
 
-int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+static int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 			size_t len)
 {
 	struct net *net = sock_net(sk);
@@ -621,7 +621,7 @@ int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	goto out;
 }
 
-int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 			size_t len, int noblock, int flags, int *addr_len)
 {
 	struct inet_sock *isk = inet_sk(sk);