iio: adis_buffer: check return value on page change

On the trigger handler, we might need to change the device page. Hence,
we should check the return value from 'spi_write()' and act accordingly.

Signed-off-by: Nuno Sa <[e-mail]>
Reviewed-by: Alexandru Ardelean <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/imu/adis_buffer.c

···
 		if (adis->current_page != 0) {
 			adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
 			adis->tx[1] = 0;
-			spi_write(adis->spi, adis->tx, 2);
+			ret = spi_write(adis->spi, adis->tx, 2);
+			if (ret) {
+				dev_err(&adis->spi->dev, "Failed to change device page: %d\n", ret);
+				mutex_unlock(&adis->state_lock);
+				goto irq_done;
+			}
 		}
 	}
 
···
 	iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
 		pf->timestamp);
 
+irq_done:
 	iio_trigger_notify_done(indio_dev->trig);
 
 	return IRQ_HANDLED;