__video_register_device: warning cannot be reached if warn_if_nr_in_use

[Richard Zhao]

In file drivers/media/video/v4l2-dev.c

int __video_register_device(struct video_device *vdev, int type, int nr,
                int warn_if_nr_in_use, struct module *owner)
{
[...]
        vdev->minor = i + minor_offset;
878:    vdev->num = nr;

vdev->num is set to nr here. 
[...]
        if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
                printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__,
                        name_base, nr, video_device_node_name(vdev));

so nr != vdev->num is always false. The warning can never be printed.

Thanks
Richard

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