driver:gpio remove all usage of gpio_remove retval in driver

this remove all reference to gpio_remove retval in all driver
except pinctrl and gpio. the same thing is done for gpio and
pinctrl in two different patches.

Signed-off-by: Abdoulaye Berthe <berthe.ab@gmail.com>
Acked-by: Michael Büsch <m@bues.ch>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/mfd/asic3.c

@@ -605,7 +605,8 @@ static int asic3_gpio_remove(struct platform_device *pdev)
 {
 	struct asic3 *asic = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&asic->gpio);
+	gpiochip_remove(&asic->gpio);
+	return 0;
 }
 
 static void asic3_clk_enable(struct asic3 *asic, struct asic3_clk *clk)