code: public void removeFromInUse(Object o) {
          if (null == o) {
              throw new NullPointerException();
          }
  
          if (inUseTracking) {
              inUseTable.remove(o);
          }
      }
docs: remove the object from the inUse before normal release processing
  would remove it. To be used in when some other code knows that
  leaving it in the InUse table would create false-positive leak
  detection hits.
  
  @param o