net: sunbmac: remove unnecessary dev_set_drvdata()

Unnecessary dev_set_drvdata() is removed, because the driver core
clears the driver data to NULL after device_release or on probe failure.

Signed-off-by: Libo Chen <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/sun/sunbmac.c

···
 
 	free_netdev(net_dev);
 
-	dev_set_drvdata(&op->dev, NULL);
-
 	return 0;
 }