ethernet: moxa: remove unnecessary platform_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: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/moxa/moxart_ether.c

@@ -533,7 +533,6 @@ static int moxart_remove(struct platform_device *pdev)
 	unregister_netdev(ndev);
 	free_irq(ndev->irq, ndev);
 	moxart_mac_free_memory(ndev);
-	platform_set_drvdata(pdev, NULL);
 	free_netdev(ndev);
 
 	return 0;