message: Remove newly introduced compiler warning.
diff: @@ -860,13 +860,10 @@ TEST_F(InlineWriteRead, InlineWriteReadContracts2)
  TEST_F(InlineWriteRead, IOInvariants)
  {
  - int mpiRank = 0, mpiSize = 1;
  #if ADIOS2_USE_MPI
  + int mpiRank = 0, mpiSize = 1;
  MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
  MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
  -#endif
  -
  -#if ADIOS2_USE_MPI
  adios2::ADIOS adios(MPI_COMM_WORLD);
  #else
  adios2::ADIOS adios;
  