message: fix manual listen/connect method of launching the MPIDevice
  [ci skip]
diff: @@ -320,7 +320,7 @@ namespace ospray {
  OSPRAY_MPI_VERBOSE_LEVEL);
  }
  - MPI_CALL(Barrier(mergedComm.comm));
  + mpi::world.barrier();
  }
  void createMPI_connectToListener(int *ac, const char **av,
  @@ -358,6 +358,8 @@ namespace ospray {
  mpi::world.comm = mergedComm.comm;
  mpi::world.makeIntraComm();
  + mpi::world.barrier();
  +
  postErrorMsg("starting worker...", OSPRAY_MPI_VERBOSE_LEVEL);
  mpi::runWorker();
  }
  