regulator: check the return value of gpiod_set_value_cansleep()

gpiod_set_value_cansleep() now returns an integer and can indicate
failures in the GPIO layer. Propagate any potential errors to regulator
core.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://patch.msgid.link/20251203084737.15891-1-bartosz.golaszewski@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Bartosz Golaszewski

drivers/regulator/core.c

@@ -2823,14 +2823,18 @@ static void regulator_ena_gpio_free(struct regulator_dev *rdev)
 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
 {
 	struct regulator_enable_gpio *pin = rdev->ena_pin;
+	int ret;
 
 	if (!pin)
 		return -EINVAL;
 
 	if (enable) {
 		/* Enable GPIO at initial use */
-		if (pin->enable_count == 0)
-			gpiod_set_value_cansleep(pin->gpiod, 1);
+		if (pin->enable_count == 0) {
+			ret = gpiod_set_value_cansleep(pin->gpiod, 1);
+			if (ret)
+				return ret;
+		}
 
 		pin->enable_count++;
 	} else {
@@ -2841,7 +2845,10 @@ static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
 
 		/* Disable GPIO if not used */
 		if (pin->enable_count <= 1) {
-			gpiod_set_value_cansleep(pin->gpiod, 0);
+			ret = gpiod_set_value_cansleep(pin->gpiod, 0);
+			if (ret)
+				return ret;
+
 			pin->enable_count = 0;
 		}
 	}