power: supply: rt5033_battery: Fix error code in rt5033_battery_probe()

In the function rt5033_battery_probe(), it should return -ENOMEM
instead of -EINVAL when call function devm_kzalloc() failed.
Signed-off-by: Peng Fan <fanpeng@loongson.cn>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/rt5033_battery.c

@@ -125,7 +125,7 @@ static int rt5033_battery_probe(struct i2c_client *client,
 
 	battery = devm_kzalloc(&client->dev, sizeof(*battery), GFP_KERNEL);
 	if (!battery)
-		return -EINVAL;
+		return -ENOMEM;
 
 	battery->client = client;
 	battery->regmap = devm_regmap_init_i2c(client,