[NET] Cleanup: Use sock_owned_by_user() macro

Changes asserts in sunrpc to use sock_owned_by_user() macro instead of
referencing sock_lock.owner directly.

Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 406b3e6..c75bffe 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -104,7 +104,7 @@
 static inline void svc_reclassify_socket(struct socket *sock)
 {
 	struct sock *sk = sock->sk;
-	BUG_ON(sk->sk_lock.owner != NULL);
+	BUG_ON(sock_owned_by_user(sk));
 	switch (sk->sk_family) {
 	case AF_INET:
 		sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",