mctp: serial: Use netif_rx().

Since commit
   baebdf48 ("net: dev: Makes sure netif_rx() can be invoked in any context.")

the function netif_rx() can be used in preemptible/thread context as
well as in interrupt context.

Use netif_rx().

Cc: Jeremy Kerr <jk@codeconstruct.com.au>
Cc: Matt Johnston <matt@codeconstruct.com.au>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mctp/mctp-serial.c

@@ -286,7 +286,7 @@ static void mctp_serial_rx(struct mctp_serial *dev)
 	cb = __mctp_cb(skb);
 	cb->halen = 0;
 
-	netif_rx_ni(skb);
+	netif_rx(skb);
 	dev->netdev->stats.rx_packets++;
 	dev->netdev->stats.rx_bytes += dev->rxlen;
 }