staging: iio: ad5933: use dev_get_platdata()

Use dev_get_platdata() for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Alison Schofield <[e-mail]>
Acked-by: Daniel Baluta <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/iio/impedance-analyzer/ad5933.c

···
 				   const struct i2c_device_id *id)
 {
 	int ret, voltage_uv = 0;
-	struct ad5933_platform_data *pdata = client->dev.platform_data;
+	struct ad5933_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct ad5933_state *st;
 	struct iio_dev *indio_dev;