The dance we do to fetch event nodes from devices seems a bit superfluous
now, and even wrong if multiple X11 devices boil down to the same event
node.
Fixes the wacom panel not showing the "Map buttons..." action on older
kernels and wacom.ko modules, because the pad device shares the event node
with the stylus. Pad device lookups in order to enable the action obtain
the stylus device, thus the action is not shown.
https://bugzilla.gnome.org/show_bug.cgi?id=793029
3bd808127d