libeis: don't ref the event on return

We're removing it from our own list when returning the event, so increasing
the refcount isn't required.

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

src/libeis.c

@@ -311,5 +311,5 @@ eis_get_event(struct eis *eis)
 	struct eis_event *e = list_first_entry(&eis->event_queue, e, link);
 	list_remove(&e->link);
 
-	return eis_event_ref(e);
+	return e;
 }