for range via return

src/publisher_laser_map.cpp

@@ -135,8 +135,7 @@ void PublisherLaserMap::updateTrajectory()
     scans_.clear();
 
     // copy new trajectory poses and scans
-    auto frame_map = problem_->getTrajectory()->getFrameMap(); // copy for thread-safe
-    for (auto frame_pair : frame_map)
+    for (auto frame_pair : problem_->getTrajectory()->getFrameMap())
     {
         if (frame_pair.second->isRemoving())
             continue;