staging: iio: resolver: ad2s1210: remove spi_set_drvdata()

Since we never call spi_get_drvdata(), we can remove spi_set_drvdata().
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20230929-ad2s1210-mainline-v3-5-fa4364281745@baylibre.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/resolver/ad2s1210.c

@@ -659,8 +659,6 @@ static int ad2s1210_probe(struct spi_device *spi)
 		return -ENOMEM;
 	st = iio_priv(indio_dev);
 
-	spi_set_drvdata(spi, indio_dev);
-
 	mutex_init(&st->lock);
 	st->sdev = spi;
 	st->hysteresis = true;