net: sh_eth: fix receive desciptor loop

Fix the problem that this driver not update rxdesc in sh_eth_rx.
Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sh_eth.c

@@ -536,6 +536,7 @@ static int sh_eth_rx(struct net_device *ndev)
 		}
 		rxdesc->status |= cpu_to_edmac(mdp, RD_RACT);
 		entry = (++mdp->cur_rx) % RX_RING_SIZE;
+		rxdesc = &mdp->rx_ring[entry];
 	}
 
 	/* Refill the Rx ring buffers. */