enc28j60: use netif_rx_ni() to deliver RX packets

The enc28j60 driver reads incoming packets in the process (workqueue) context, not in a tasklet or the interrupt context. Thus, we should use netif_rx_ni() to deliver those packets to the networking layer, instead of netif_rx(). This way incoming packets don't wait in the incoming queue for the next IRQ to be serviced.

---

@@ -959,7 +959,7 @@ static void enc28j60_hw_rx(struct net_de
 			ndev->stats.rx_packets++;
 			ndev->stats.rx_bytes += len;
 			ndev->last_rx = jiffies;
-			netif_rx(skb);
+			netif_rx_ni(skb);
 		}
 	}
 	/*

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