drm/imx/dcss: Drop if blocks with always false condition

dcss_drv_platform_remove() is only called for a device after
dcss_drv_platform_probe() returned 0. In that case dev_set_drvdata() was
called with a non-NULL value and so dev_get_drvdata() won't return NULL.

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

···
 {
 	struct dcss_drv *mdrv = dev_get_drvdata(&pdev->dev);
 
-	if (!mdrv)
-		return 0;
-
 	dcss_kms_detach(mdrv->kms);
 	dcss_dev_destroy(mdrv->dcss);