ehea: fix last_rx update

Update last_rx in registered device struct instead of
in the dummy device.
Signed-off-by: NJan-Bernd Themann <themann@de.ibm.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/ehea/ehea_main.c

@@ -471,7 +471,7 @@ static struct ehea_cqe *ehea_proc_rwqes(struct net_device *dev,
 			else
 				netif_receive_skb(skb);
 
-			dev->last_rx = jiffies;
+			port->netdev->last_rx = jiffies;
 		} else {
 			pr->p_stats.poll_receive_errors++;
 			port_reset = ehea_treat_poll_error(pr, rq, cqe,