sctp: consolidate local_bh_disable/enable + spin_lock/unlock to _bh variant

local_bh_disable() + spin_lock() is equivalent to spin_lock_bh(), same for
the unlock/enable case, so replace the calls by the appropriate wrappers.
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Acked-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/sctp/socket.c

@@ -7254,14 +7254,12 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
 	/* Hook this new socket in to the bind_hash list. */
 	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
 						 inet_sk(oldsk)->inet_num)];
-	local_bh_disable();
-	spin_lock(&head->lock);
+	spin_lock_bh(&head->lock);
 	pp = sctp_sk(oldsk)->bind_hash;
 	sk_add_bind_node(newsk, &pp->owner);
 	sctp_sk(newsk)->bind_hash = pp;
 	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
-	spin_unlock(&head->lock);
-	local_bh_enable();
+	spin_unlock_bh(&head->lock);
 
 	/* Copy the bind_addr list from the original endpoint to the new
 	 * endpoint so that we can handle restarts properly