power: supply: bq27xxx: Use mod_delayed_work() instead of cancel() + schedule()

Use mod_delayed_work() instead of separate cancel_delayed_work_sync() +
schedule_delayed_work() calls.

Signed-off-by: Hans de Goede <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/bq27xxx_battery.c

···
 		return ret;
 
 	mutex_lock(&bq27xxx_list_lock);
-	list_for_each_entry(di, &bq27xxx_battery_devices, list) {
-		cancel_delayed_work_sync(&di->work);
-		schedule_delayed_work(&di->work, 0);
-	}
+	list_for_each_entry(di, &bq27xxx_battery_devices, list)
+		mod_delayed_work(system_wq, &di->work, 0);
 	mutex_unlock(&bq27xxx_list_lock);
 
 	return ret;