regulator: core: Fix logic to determinate if regulator can change voltage

Having a linear_min_sel setting means the first linear_min_sel selectors are
invalid. We need to subtract linear_min_sel when use n_voltages to determinate
if regulator can change voltage.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/regulator/core.c

@@ -1881,7 +1881,7 @@ int regulator_can_change_voltage(struct regulator *regulator)
 
 	if (rdev->constraints &&
 	    rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE &&
-	    rdev->desc->n_voltages > 1)
+	    (rdev->desc->n_voltages - rdev->desc->linear_min_sel) > 1)
 		return 1;
 
 	return 0;