Possible bug in __fenix_test_MPI related to MPICH symbol

[rfvander]

At the end of a switch statement in the function we have the code fragment below. It looks to me that the part protected by #ifdef MPICH can never be reached and would actually be a syntax error if the symbol is enabled.

      break;
    case MPI_ERR_INTERN: 
      printf("MPI_ERR_INTERN\n"); 
      break; 
    default: 
      break; 
#ifdef MPICH 
    MPIF_Comm_revoke(*__fenix_g_world); 
    MPIF_Comm_revoke(*__fenix_g_new_world); 
    //MPIF_Comm_revoke(*__fenix_g_user_world); 
    __fenix_g_repair_result = __fenix_repair_ranks(); 
#endif 
  }