net: tipc: Convert to use the preferred fallthrough macro

Convert the uses of fallthrough comments to fallthrough macro.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/bearer.c

@@ -652,7 +652,7 @@ static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 			test_and_set_bit_lock(0, &b->up);
 			break;
 		}
-		/* fall through */
+		fallthrough;
 	case NETDEV_GOING_DOWN:
 		clear_bit_unlock(0, &b->up);
 		tipc_reset_bearer(net, b);

net/tipc/link.c

@@ -1239,7 +1239,7 @@ static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
 			skb_queue_tail(mc_inputq, skb);
 			return true;
 		}
-		/* fall through */
+		fallthrough;
 	case CONN_MANAGER:
 		skb_queue_tail(inputq, skb);
 		return true;

net/tipc/socket.c

@@ -783,7 +783,7 @@ static __poll_t tipc_poll(struct file *file, struct socket *sock,
 	case TIPC_ESTABLISHED:
 		if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
 			revents |= EPOLLOUT;
-		/* fall through */
+		fallthrough;
 	case TIPC_LISTEN:
 	case TIPC_CONNECTING:
 		if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
@@ -2597,7 +2597,7 @@ static int tipc_connect(struct socket *sock, struct sockaddr *dest,
 		 * case is EINPROGRESS, rather than EALREADY.
 		 */
 		res = -EINPROGRESS;
-		/* fall through */
+		fallthrough;
 	case TIPC_CONNECTING:
 		if (!timeout) {
 			if (previous == TIPC_CONNECTING)