[Bug 196678] x11-servers/xorg-server: make config/devd recognize /dev/input/eventX from multimedia/webcamd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196678

--- Comment #66 from Vladimir Kondratyev <vladimir at kondratyev.su> ---
(In reply to Vladimir Kondratyev from comment #65)
At second glance this patch may be wrong:
1. Linux returns ENODEV error code for read () if device is gone
2. Webcamd does not know nothing about ENODEV and converts it to default
CUSE_ERR_OTHER
3. Cuse converts CUSE_ERR_OTHER to ENXIO and returns it to userworld (wacom
driver).
4. Wacom driver ignores ENXIO as EINVAL is expected

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