NewInputDeviceRequest (and RemoveDevice) have checks in place to not allow
removal of the VCP/VCK. When shutting down, they need to be cleaned up
nonetheless to free the memory associated.
X.Org Bug 25028 <http://bugs.freedesktop.org/show_bug.cgi?id=25028>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Keith Packard <keithp@keithp.com>