ab3100: fix off-by-one value range checking for voltage selector

We use voltage selector as an array index for typ_voltages.
Thus the valid range for voltage selector should be 0..voltages_len-1.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/ab3100.c

@@ -286,7 +286,7 @@ static int ab3100_list_voltage_regulator(struct regulator_dev *reg,
 {
 	struct ab3100_regulator *abreg = reg->reg_data;
 
-	if (selector > abreg->voltages_len)
+	if (selector >= abreg->voltages_len)
 		return -EINVAL;
 	return abreg->typ_voltages[selector];
 }
@@ -318,7 +318,7 @@ static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
 	regval &= 0xE0;
 	regval >>= 5;
 
-	if (regval > abreg->voltages_len) {
+	if (regval >= abreg->voltages_len) {
 		dev_err(&reg->dev,
 			"regulator register %02x contains an illegal voltage setting\n",
 			abreg->regreg);