mfd: 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: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/tps80031.c b/drivers/mfd/tps80031.c
index c90a2c4..f15ee6d 100644
--- a/drivers/mfd/tps80031.c
+++ b/drivers/mfd/tps80031.c
@@ -418,7 +418,7 @@
 static int tps80031_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
-	struct tps80031_platform_data *pdata = client->dev.platform_data;
+	struct tps80031_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct tps80031 *tps80031;
 	int ret;
 	uint8_t es_version;