net: ping: Use right format specifier to avoid type casting

The inet_num is u16, so use %hu instead of casting it to int. And
the sk_bound_dev_if is int actually, so it needn't cast to int.
Signed-off-by: NGao Feng <fgao@ikuai8.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ping.c

@@ -433,9 +433,9 @@ int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 		goto out;
 	}
 
-	pr_debug("after bind(): num = %d, dif = %d\n",
-		 (int)isk->inet_num,
-		 (int)sk->sk_bound_dev_if);
+	pr_debug("after bind(): num = %hu, dif = %d\n",
+		 isk->inet_num,
+		 sk->sk_bound_dev_if);
 
 	err = 0;
 	if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)