message: fix missing return in a function
diff: @@ -328,6 +328,7 @@ int CommImplDummy::Win_shared_query(Comm::Win &win, int rank, size_t *size,
  int CommImplDummy::Win_free(Comm::Win &win, const std::string &) const
  {
  win.Free();
  + return 0;
  }
  int CommImplDummy::Win_Lock(Comm::LockType lock_type, int rank, int assert,
  