media: saa7134: fix saa7134_initdev error handling logic

Smatch reported an issue there:
	drivers/media/pci/saa7134/saa7134-core.c:1302 saa7134_initdev() warn: '&dev->devlist' not removed from list

But besides freeing the list, the media controller graph also
needs to be cleaned up on errors. Address those issues.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/pci/saa7134/saa7134-core.c

@@ -1277,14 +1277,17 @@ static int saa7134_initdev(struct pci_dev *pci_dev,
 	 */
 #ifdef CONFIG_MEDIA_CONTROLLER
 	err = media_device_register(dev->media_dev);
-	if (err)
+	if (err) {
+		media_device_cleanup(dev->media_dev);
 		goto err_unregister_video;
+	}
 #endif
 
 	return 0;
 
 err_unregister_video:
 	saa7134_unregister_video(dev);
+	list_del(&dev->devlist);
 	saa7134_i2c_unregister(dev);
 	free_irq(pci_dev->irq, dev);
 err_iounmap: