staging:iio:adc:ad7476: Incorrect pointer into spi_set_drvdata.

Will cause issues only on driver removal.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/adc/ad7476_core.c

@@ -159,7 +159,7 @@ static int __devinit ad7476_probe(struct spi_device *spi)
 	else
 		dev_warn(&spi->dev, "reference voltage unspecified\n");
 
-	spi_set_drvdata(spi, st);
+	spi_set_drvdata(spi, indio_dev);
 
 	st->spi = spi;