A WarpPointer request may trigger a motion event on a device without
valuators. That request is ignored by GetPointerEvents but during smooth
scroll emulation we dereference dev->valuators to get the number of axes.
Break out early if the device doesn't have valuators.
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>