Fix publisher/subscriber Count (#129)
Fix publisher/subscriber Count (#129)

* Fixed the counting up, but the count does not decrement when the nodes stop listening.

* Removed lambda, fixed typo.

* Added debug message for the case wherein an attempt to remove a subscription which was never registered.

* Add missed brace.

ros2/rmw_fastrtps,jwang11/rmw_fastrtps,ros2/rmw_fastrtps,jwang11/rmw_fastrtps,eProsima/ROS-RMW-Fast-RTPS-cpp