iio: humidity: hts221: use irq_get_trigger_type()

Use irq_get_trigger_type() to replace getting the irq data then the
type in two steps.

Reviewed-by: Lorenzo Bianconi <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/humidity/hts221_buffer.c

···
 	unsigned long irq_type;
 	int err;
 
-	irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));
-
+	irq_type = irq_get_trigger_type(hw->irq);
 	switch (irq_type) {
 	case IRQF_TRIGGER_HIGH:
 	case IRQF_TRIGGER_RISING: