gpio: timberdale: remove unnecessary platform_set_drvdata()

The driver core clears the driver data to NULL after device_release
or on probe failure, since commit 0998d063
(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 <jg1.han@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-timberdale.c

@@ -342,8 +342,6 @@ static int timbgpio_remove(struct platform_device *pdev)
 	release_mem_region(iomem->start, resource_size(iomem));
 	kfree(tgpio);
 
-	platform_set_drvdata(pdev, NULL);
-
 	return 0;
 }