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/lp3972.c b/drivers/regulator/lp3972.c
index 5730240..093e6f4 100644
--- a/drivers/regulator/lp3972.c
+++ b/drivers/regulator/lp3972.c
@@ -519,7 +519,7 @@
 			    const struct i2c_device_id *id)
 {
 	struct lp3972 *lp3972;
-	struct lp3972_platform_data *pdata = i2c->dev.platform_data;
+	struct lp3972_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	int ret;
 	u16 val;