- device_create_file(&pdev->dev, &dev_attr_battery_percentage);
- device_create_file(&pdev->dev, &dev_attr_battery_voltage);
+ ret = device_create_file(&pdev->dev, &dev_attr_battery_percentage);
+ ret |= device_create_file(&pdev->dev, &dev_attr_battery_voltage);
+ if (ret != 0)
+ dev_warn(&pdev->dev, "Failed to register attributes (%d)\n", ret);