Check for duplicates
Check for duplicates

Before probing the device we check whether the device is already registered to
avoid duplicates.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@googlemail.com>

dnschneid/xf86-input-xwiimote,dvdhrm/xf86-input-xwiimote,dnschneid/xf86-input-xwiimote,dvdhrm/xf86-input-xwiimote