iio: humidity: hts221: Use dev_get_platdata() to get platform_data

Use dev_get_platdata() to get the platform_data instead of
referencing it directly.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/humidity/hts221_buffer.c

@@ -74,10 +74,10 @@ static irqreturn_t hts221_trigger_handler_thread(int irq, void *private)
 
 int hts221_allocate_trigger(struct hts221_hw *hw)
 {
+	struct st_sensors_platform_data *pdata = dev_get_platdata(hw->dev);
 	struct iio_dev *iio_dev = iio_priv_to_dev(hw);
 	bool irq_active_low = false, open_drain = false;
 	struct device_node *np = hw->dev->of_node;
-	struct st_sensors_platform_data *pdata;
 	unsigned long irq_type;
 	int err;
 
@@ -106,7 +106,6 @@ int hts221_allocate_trigger(struct hts221_hw *hw)
 	if (err < 0)
 		return err;
 
-	pdata = (struct st_sensors_platform_data *)hw->dev->platform_data;
 	if ((np && of_property_read_bool(np, "drive-open-drain")) ||
 	    (pdata && pdata->open_drain)) {
 		irq_type |= IRQF_SHARED;