net: Remove iocb argument from sendmsg and recvmsg

After TIPC doesn't depend on iocb argument in its internal
implementations of sendmsg() and recvmsg() hooks defined in proto
structure, no any user is using iocb argument in them at all now.
Then we can drop the redundant iocb argument completely from kinds of
implementations of both sendmsg() and recvmsg() in the entire
networking stack.

Cc: Christoph Hellwig <hch@lst.de>
Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index bd46f73..fee25c0 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -77,8 +77,7 @@
 	return 0;
 }
 
-int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
-		    size_t len)
+int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 {
 	struct inet_sock *inet = inet_sk(sk);
 	struct ipv6_pinfo *np = inet6_sk(sk);