gpio: pca9570: Use devm_mutex_init() for mutex initialization

Use devm_mutex_init() since it brings some benefits when
CONFIG_DEBUG_MUTEXES is enabled.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20260113111156.188051-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

Author: andy-shev

drivers/gpio/gpio-pca9570.c

@@ -115,7 +115,9 @@ static int pca9570_set(struct gpio_chip *chip, unsigned int offset, int value)
 
 static int pca9570_probe(struct i2c_client *client)
 {
+	struct device *dev = &client->dev;
 	struct pca9570 *gpio;
+	int ret;
 
 	gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
 	if (!gpio)
@@ -132,7 +134,9 @@ static int pca9570_probe(struct i2c_client *client)
 	gpio->chip.ngpio = gpio->chip_data->ngpio;
 	gpio->chip.can_sleep = true;
 
-	mutex_init(&gpio->lock);
+	ret = devm_mutex_init(dev, &gpio->lock);
+	if (ret)
+		return ret;
 
 	/* Read the current output level */
 	pca9570_read(gpio, &gpio->out);