ACPI: battery: 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: 0710c1c ("ACPI: battery: initialize mutexes through devm_ APIs")
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Thomas Weißschuh <[email protected]>
Link: https://patch.msgid.link/[email protected]
[ rjw: Added 2 empty code lines ]
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: andy-shev

drivers/acpi/battery.c

@@ -1225,8 +1225,14 @@ static int acpi_battery_add(struct acpi_device *device)
 	strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 	strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 	device->driver_data = battery;
-	devm_mutex_init(&device->dev, &battery->lock);
-	devm_mutex_init(&device->dev, &battery->sysfs_lock);
+	result = devm_mutex_init(&device->dev, &battery->lock);
+	if (result)
+		return result;
+
+	result = devm_mutex_init(&device->dev, &battery->sysfs_lock);
+	if (result)
+		return result;
+
 	if (acpi_has_method(battery->device->handle, "_BIX"))
 		set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);