regulator: tps6524x: Fix get_voltage_sel for fixed voltage

get_voltage_sel() should return selector rather than voltage.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/regulator/tps6524x-regulator.c

@@ -482,7 +482,7 @@ static int get_voltage_sel(struct regulator_dev *rdev)
 	info	= &supply_info[rdev_get_id(rdev)];
 
 	if (info->flags & FIXED_VOLTAGE)
-		return info->fixed_voltage;
+		return 0;
 
 	ret = read_field(hw, &info->voltage);
 	if (ret < 0)