power: return the correct error code

In POWER_SUPPLY_PROP_MODEL_NAME branch of max1720x_battery_get_property(),
program would return -ENODEV out of FIELD_GET error, but it's better also
considering the error code returned by regmap_read() in case it fails.

Signed-off-by: Yuanjun Gong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/supply/max1720x_battery.c

···
 		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME:
 		ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, &reg_val);
+		if (ret)
+			return ret;
 		reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val);
 		if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17201)
 			val->strval = max17201_model;