[PATCH] e1000: Fix Netpoll issue

Fixed an issue netpoll would error out during communication, generating the following error:
--netdump[14973]: Got toomany timeouts in handshaking, ...
Even after a kernel panic, netpoll requires two way communication to successfully transfer the crash log to the remote server.
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: NJohn Ronciak <john.ronciak@intel.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

drivers/net/e1000/e1000_main.c

@@ -4449,6 +4449,9 @@ e1000_netpoll(struct net_device *netdev)
 	disable_irq(adapter->pdev->irq);
 	e1000_intr(adapter->pdev->irq, netdev, NULL);
 	e1000_clean_tx_irq(adapter, adapter->tx_ring);
+#ifndef CONFIG_E1000_NAPI
+	adapter->clean_rx(adapter, adapter->rx_ring);
+#endif
 	enable_irq(adapter->pdev->irq);
 }
 #endif