leds: leds-gpio: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release
or on probe failure, since commit 0998d0631001288a5974afc0b2a5f568bcdecb4d
(device-core: Ensure drvdata = NULL when no driver is bound).
Thus, it is not needed to manually clear the device driver data to NULL.

Signed-off-by: Jingoo Han <[e-mail]>
Signed-off-by: Bryan Wu <[e-mail]>

drivers/leds/leds-gpio.c

···
 	for (i = 0; i < priv->num_leds; i++)
 		delete_gpio_led(&priv->leds[i]);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }