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 <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Signed-off-by: Liam Girdwood <[e-mail]>

drivers/regulator/ab3100.c

···
 {
 	struct ab3100_regulator *abreg = reg->reg_data;
 
-	if (selector > abreg->voltages_len)
+	if (selector >= abreg->voltages_len)
 		return -EINVAL;
 	return abreg->typ_voltages[selector];
 }
···
 	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);