pinctrl: apple: check devm_kasprintf() returned value

devm_kasprintf() can return a NULL pointer on failure but this returned
value is not checked. Fix this lack and check the returned value.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: a0f160f ("pinctrl: add pinctrl/GPIO driver for Apple SoCs")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Reviewed-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/20240905020917.356534-1-make24@iscas.ac.cn
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: Ma Ke

drivers/pinctrl/pinctrl-apple-gpio.c

@@ -474,6 +474,9 @@ static int apple_gpio_pinctrl_probe(struct platform_device *pdev)
 	for (i = 0; i < npins; i++) {
 		pins[i].number = i;
 		pins[i].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "PIN%u", i);
+		if (!pins[i].name)
+			return -ENOMEM;
+
 		pins[i].drv_data = pctl;
 		pin_names[i] = pins[i].name;
 		pin_nums[i] = i;