rtc: ds1307: use octal permissions

Octal permissions are preferred over symbolic permissions.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-ds1307.c

@@ -1051,7 +1051,7 @@ static ssize_t ds3231_hwmon_show_temp(struct device *dev,
 
 	return sprintf(buf, "%d\n", temp);
 }
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ds3231_hwmon_show_temp,
+static SENSOR_DEVICE_ATTR(temp1_input, 0444, ds3231_hwmon_show_temp,
 			  NULL, 0);
 
 static struct attribute *ds3231_hwmon_attrs[] = {