wan: pc300too: remove unnecessary pci_set_drvdata()

The driver core clears the driver data to NULL after device_release
or on probe failure. Thus, it is not needed to manually clear the
device driver data to NULL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/pc300too.c

@@ -281,7 +281,6 @@ static void pc300_pci_remove_one(struct pci_dev *pdev)
 
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
-	pci_set_drvdata(pdev, NULL);
 	if (card->ports[0].netdev)
 		free_netdev(card->ports[0].netdev);
 	if (card->ports[1].netdev)