Drop double empty lines

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Don't process events from devices that got removed already

If the driver doesn't have a pInfo reference anymore for a libinput device,
don't bother processing events, the device was already removed. This was
triggered by the libevdev test suite which adds/removes devices very quickly.

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