pinctrl: at91: Make use of for_each_requested_gpio()

Make use of for_each_requested_gpio() instead of home grown analogue.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200615150545.87964-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-at91.c

@@ -1486,14 +1486,11 @@ static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 	int i;
 	struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
 	void __iomem *pio = at91_gpio->regbase;
+	const char *gpio_label;
 
-	for (i = 0; i < chip->ngpio; i++) {
+	for_each_requested_gpio(chip, i, gpio_label) {
 		unsigned mask = pin_to_mask(i);
-		const char *gpio_label;
 
-		gpio_label = gpiochip_is_requested(chip, i);
-		if (!gpio_label)
-			continue;
 		mode = at91_gpio->ops->get_periph(pio, mask);
 		seq_printf(s, "[%s] GPIO%s%d: ",
 			   gpio_label, chip->label, i);