drm: omapdrm: dss: Don't unnecessarily cast to dev to pdev and back

The dss_unbind() function casts the struct device pointer to a struct
platform_device, only to later use the struct device pointer from
platform_device. Don't cast at all.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

drivers/gpu/drm/omapdrm/dss/dss.c

@@ -1332,11 +1332,9 @@ static int dss_bind(struct device *dev)
 
 static void dss_unbind(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-
 	omapdss_set_is_initialized(false);
 
-	component_unbind_all(&pdev->dev, NULL);
+	component_unbind_all(dev, NULL);
 }
 
 static const struct component_master_ops dss_component_ops = {