power: supply: core: simplify charge_behaviour formatting

The function power_supply_show_charge_behaviour() is not needed and can
be removed completely.
Removing the function also saves a spurious read of the property from
the driver on each call.

The convulted logic was a leftover from an earlier patch revision.
Some restructuring made this cleanup possible.

Suggested-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/all/9e035ae4-cb07-4f84-8336-1a0050855bea@redhat.com/
Fixes: 4e61f1e ("power: supply: core: fix charge_behaviour formatting")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240329-power-supply-simplify-v1-1-416f1002739f@weissschuh.net
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/power_supply_sysfs.c

@@ -271,23 +271,6 @@ static ssize_t power_supply_show_usb_type(struct device *dev,
 	return count;
 }
 
-static ssize_t power_supply_show_charge_behaviour(struct device *dev,
-						  struct power_supply *psy,
-						  union power_supply_propval *value,
-						  char *buf)
-{
-	int ret;
-
-	ret = power_supply_get_property(psy,
-					POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
-					value);
-	if (ret < 0)
-		return ret;
-
-	return power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
-						  value->intval, buf);
-}
-
 static ssize_t power_supply_show_property(struct device *dev,
 					  struct device_attribute *attr,
 					  char *buf) {
@@ -321,7 +304,8 @@ static ssize_t power_supply_show_property(struct device *dev,
 						&value, buf);
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
-		ret = power_supply_show_charge_behaviour(dev, psy, &value, buf);
+		ret = power_supply_charge_behaviour_show(dev, psy->desc->charge_behaviours,
+							 value.intval, buf);
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
 		ret = sysfs_emit(buf, "%s\n", value.strval);