drm/imx/dcss: Don't call dev_set_drvdata(..., NULL);

The driver core takes care about removing driver data, so this can be
dropped from the driver.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Reviewed-by: Laurentiu Palcu <[e-mail]>
Signed-off-by: Laurentiu Palcu <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/imx/dcss/dcss-drv.c

···
 dcss_shutoff:
 	dcss_dev_destroy(mdrv->dcss);
 
-	dev_set_drvdata(dev, NULL);
-
 err:
 	kfree(mdrv);
 	return err;
···
 
 	dcss_kms_detach(mdrv->kms);
 	dcss_dev_destroy(mdrv->dcss);
-
-	dev_set_drvdata(&pdev->dev, NULL);
 
 	kfree(mdrv);