net: sun4i-emac: Remove redundant platform_set_drvdata()

Commit 0998d06 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: Stefan Roese <sr@denx.de>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/allwinner/sun4i-emac.c

@@ -898,8 +898,6 @@ static int emac_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 
-	platform_set_drvdata(pdev, NULL);
-
 	unregister_netdev(ndev);
 	free_netdev(ndev);