pinctrl: coh901: 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/pinctrl/pinctrl-coh901.c

@@ -856,7 +856,6 @@ static int __exit u300_gpio_remove(struct platform_device *pdev)
 	}
 	u300_gpio_free_ports(gpio);
 	clk_disable_unprepare(gpio->clk);
-	platform_set_drvdata(pdev, NULL);
 	return 0;
 }