regulator: fix enabling regulator issue on max8925

Fix regulator enabling issue that is caused by typo error in is_enabled().
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/max8925-regulator.c

@@ -109,7 +109,7 @@ static int max8925_is_enabled(struct regulator_dev *rdev)
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 	int ret;
 
-	ret = max8925_reg_read(info->i2c, info->vol_reg);
+	ret = max8925_reg_read(info->i2c, info->enable_reg);
 	if (ret < 0)
 		return ret;