media: v4l2-core: return -ENODEV from ioctl when not registered

I spotted a minor difference is handling of unregistered devices
between native and compat ioctls: the native handler never tries
to call into the driver if a device is not marked as registered.

I did not check whether this can cause issues in the kernel, or
just a different between return codes, but it clearly makes
sense that both should behave the same way.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/v4l2-core/v4l2-compat-ioctl32.c

@@ -1244,6 +1244,9 @@ long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
 	if (!file->f_op->unlocked_ioctl)
 		return ret;
 
+	if (!video_is_registered(vdev))
+		return -ENODEV;
+
 	if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
 		ret = file->f_op->unlocked_ioctl(file, cmd,
 					(unsigned long)compat_ptr(arg));