spi: pl022: remove unnecessary amba_set_drvdata()

The driver core clears the driver data to NULL after device_release
or on probe failure. Thus, it is not needed to manually clear the
device driver data to NULL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/spi/spi-pl022.c

@@ -2286,7 +2286,6 @@ pl022_remove(struct amba_device *adev)
 	amba_release_regions(adev);
 	tasklet_disable(&pl022->pump_transfers);
 	spi_unregister_master(pl022->master);
-	amba_set_drvdata(adev, NULL);
 	return 0;
 }