gpio: sloppy-logic-analyzer: Check for error code from devm_mutex_init() call

Even if it's not critical, the avoidance of checking the error code
from devm_mutex_init() call today diminishes the point of using devm
variant of it. Tomorrow it may even leak something. Add the missed
check.

Fixes: 7828b7b ("gpio: add sloppy logic analyzer using polling")
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20241030174132.2113286-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: andy-shev

drivers/gpio/gpio-sloppy-logic-analyzer.c

@@ -234,7 +234,9 @@ static int gpio_la_poll_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	devm_mutex_init(dev, &priv->blob_lock);
+	ret = devm_mutex_init(dev, &priv->blob_lock);
+	if (ret)
+		return ret;
 
 	fops_buf_size_set(priv, GPIO_LA_DEFAULT_BUF_SIZE);