media: cedrus: Fix initialization order

Currently, MEDIA_IOC_G_TOPOLOGY ioctl on cedrus fails due to incorrect
initialization order. Fix that by moving video_register_device() before
v4l2_m2m_register_media_controller() and while at it, fix error path.
Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/sunxi/cedrus/cedrus.c

@@ -300,7 +300,7 @@ static int cedrus_probe(struct platform_device *pdev)
 			 "Failed to initialize V4L2 M2M device\n");
 		ret = PTR_ERR(dev->m2m_dev);
 
-		goto err_video;
+		goto err_v4l2;
 	}
 
 	dev->mdev.dev = &pdev->dev;
@@ -310,23 +310,23 @@ static int cedrus_probe(struct platform_device *pdev)
 	dev->mdev.ops = &cedrus_m2m_media_ops;
 	dev->v4l2_dev.mdev = &dev->mdev;
 
-	ret = v4l2_m2m_register_media_controller(dev->m2m_dev, vfd,
-						 MEDIA_ENT_F_PROC_VIDEO_DECODER);
-	if (ret) {
-		v4l2_err(&dev->v4l2_dev,
-			 "Failed to initialize V4L2 M2M media controller\n");
-		goto err_m2m;
-	}
-
 	ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
 	if (ret) {
 		v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
-		goto err_v4l2;
+		goto err_m2m;
 	}
 
 	v4l2_info(&dev->v4l2_dev,
 		  "Device registered as /dev/video%d\n", vfd->num);
 
+	ret = v4l2_m2m_register_media_controller(dev->m2m_dev, vfd,
+						 MEDIA_ENT_F_PROC_VIDEO_DECODER);
+	if (ret) {
+		v4l2_err(&dev->v4l2_dev,
+			 "Failed to initialize V4L2 M2M media controller\n");
+		goto err_video;
+	}
+
 	ret = media_device_register(&dev->mdev);
 	if (ret) {
 		v4l2_err(&dev->v4l2_dev, "Failed to register media device\n");
@@ -339,10 +339,10 @@ static int cedrus_probe(struct platform_device *pdev)
 
 err_m2m_mc:
 	v4l2_m2m_unregister_media_controller(dev->m2m_dev);
-err_m2m:
-	v4l2_m2m_release(dev->m2m_dev);
 err_video:
 	video_unregister_device(&dev->vfd);
+err_m2m:
+	v4l2_m2m_release(dev->m2m_dev);
 err_v4l2:
 	v4l2_device_unregister(&dev->v4l2_dev);