cosa: update last_rx after netif_rx

@@ -738,14 +738,14 @@
 		chan->stats.rx_frame_errors++;
 		return 0;
 	}
-	chan->rx_skb->protocol = htons(ETH_P_WAN_PPP);
+	chan->rx_skb->protocol = __constant_htons(ETH_P_WAN_PPP);
 	chan->rx_skb->dev = chan->pppdev.dev;
 	chan->rx_skb->mac.raw = chan->rx_skb->data;
 	chan->stats.rx_packets++;
 	chan->stats.rx_bytes += chan->cosa->rxsize;
 	netif_rx(chan->rx_skb);
 	chan->rx_skb = 0;
-	chan->pppdev.dev->trans_start = jiffies;
+	chan->pppdev.dev->last_rx = jiffies;
 	return 0;
 }