message: removes initialized check in map_rank_to_device_id
diff: @@ -69,14 +69,8 @@ int map_rank_to_device_id(MPI_Comm comm, const int num_devices)
  // we determine the node-local rank with MPI calls.
  int local_rank;
  int compare_result;
  - int is_initialized;
  - GKO_ASSERT_NO_MPI_ERRORS(MPI_Initialized(&is_initialized));
  - if (is_initialized) {
  GKO_ASSERT_NO_MPI_ERRORS(
  MPI_Comm_compare(comm, MPI_COMM_WORLD, &compare_result));
  - } else {
  - compare_result = MPI_IDENT;
  - }
  if (compare_result != MPI_IDENT && compare_result != MPI_CONGRUENT) {
  local_rank = mpi_node_local_rank(comm);
  } else {
  