pinctrl: bcm2835: Handle gpiochip_add_pin_range() errors

[ Upstream commit cdf7e61612 ]

gpiochip_add_pin_range() can fail, so better return its error code than
a hard coded '0'.

Fixes: d2b67744fd ("pinctrl: bcm2835: implement hook for missing gpio-ranges")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/98c3b5890bb72415145c9fe4e1d974711edae376.1681681402.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/pinctrl/bcm/pinctrl-bcm2835.c

@@ -359,10 +359,8 @@ static int bcm2835_of_gpio_ranges_fallback(struct gpio_chip *gc,
 	if (!pctldev)
 		return 0;
 
-	gpiochip_add_pin_range(gc, pinctrl_dev_get_devname(pctldev), 0, 0,
+	return gpiochip_add_pin_range(gc, pinctrl_dev_get_devname(pctldev), 0, 0,
 				      gc->ngpio);
-
-	return 0;
 }
 
 static const struct gpio_chip bcm2835_gpio_chip = {