V4L/DVB (10791): videodev: not possible to register NULL video_device

video_register_device_index() checks if it was passed a NULL video_device
pointer (which isn't allowed) _after_ it has already dereferenced it with
video_get_drvdata(vdev).  The checks are clearly pointless and can be
removed, as the function would have crashed before reaching them if vdev
ever was NULL.
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/v4l2-dev.c

@@ -366,12 +366,11 @@ int video_register_device_index(struct video_device *vdev, int type, int nr,
 
 	/* A minor value of -1 marks this video device as never
 	   having been registered */
-	if (vdev)
-		vdev->minor = -1;
+	vdev->minor = -1;
 
 	/* the release callback MUST be present */
-	WARN_ON(!vdev || !vdev->release);
-	if (!vdev || !vdev->release)
+	WARN_ON(!vdev->release);
+	if (!vdev->release)
 		return -EINVAL;
 
 	/* Part 1: check device type */