Sundry tweaks to aos/vision libs

Change-Id: Ia5578dcf2d42ac53b81af239bf329eb084fcf1d9
diff --git a/aos/vision/events/epoll_events.h b/aos/vision/events/epoll_events.h
index ee288c4..3b7d75a 100644
--- a/aos/vision/events/epoll_events.h
+++ b/aos/vision/events/epoll_events.h
@@ -44,7 +44,7 @@
     // Duplicate above to allow Done to change itself.
     if (time_ < monotonic_clock::epoch()) return -1;
     if (time_ <= now) {
-      return -1;// Recalculate(now);
+      return -1;
     }
 
     if (time_ - now > ::std::chrono::milliseconds(INT_MAX)) {