regulator: use dev_get_platdata()

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/regulator/88pm800.c b/drivers/regulator/88pm800.c
index b4c29b1..c72fe95 100644
--- a/drivers/regulator/88pm800.c
+++ b/drivers/regulator/88pm800.c
@@ -283,7 +283,7 @@
 static int pm800_regulator_probe(struct platform_device *pdev)
 {
 	struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
-	struct pm80x_platform_data *pdata = pdev->dev.parent->platform_data;
+	struct pm80x_platform_data *pdata = dev_get_platdata(pdev->dev.parent);
 	struct pm800_regulators *pm800_data;
 	struct pm800_regulator_info *info;
 	struct regulator_config config = { };