net: Add sk_set_socket() helper.

In order to more easily grep for all things that set
sk->sk_socket, add sk_set_socket() helper inline function.

Suggested (although only half-seriously) by Evgeniy Polyakov.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sock.h b/include/net/sock.h
index a7c3041..3f4897a 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -990,6 +990,11 @@
 extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
 			  const int nested);
 
+static inline void sk_set_socket(struct sock *sk, struct socket *sock)
+{
+	sk->sk_socket = sock;
+}
+
 /* Detach socket from process context.
  * Announce socket dead, detach it from wait queue and inode.
  * Note that parent inode held reference count on this struct sock,
@@ -1001,7 +1006,7 @@
 {
 	write_lock_bh(&sk->sk_callback_lock);
 	sock_set_flag(sk, SOCK_DEAD);
-	sk->sk_socket = NULL;
+	sk_set_socket(sk, NULL);
 	sk->sk_sleep  = NULL;
 	write_unlock_bh(&sk->sk_callback_lock);
 }
@@ -1011,7 +1016,7 @@
 	write_lock_bh(&sk->sk_callback_lock);
 	sk->sk_sleep = &parent->wait;
 	parent->sk = sk;
-	sk->sk_socket = parent;
+	sk_set_socket(sk, parent);
 	security_sock_graft(sk, parent);
 	write_unlock_bh(&sk->sk_callback_lock);
 }