Return BadValue if EvdevOpenMTDev fails

FALSE == Success, so if we fail during EvdevOpenMTDev, the caller thinks
that everything worked fine, proceeds to set up the fd, etc.

This may later cause a crash, when a device comes back later as different
device and posts axis events where we didn't configure axes in the first
place.

Note: Unclear why there was no udev event received for the device being
removed and coming back as different device though.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

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