message: fix matrix_generator warnings
diff: @@ -238,8 +238,8 @@ std::unique_ptr<MatrixType> generate_random_triangular_matrix(
  for (size_type nz = 0; nz < nnz_in_row; ++nz) {
  auto col = col_idx[nz];
  // skip non-zeros outside triangle
  - if (col > row && lower_triangular ||
  - col < row && !lower_triangular) {
  + if ((col > row && lower_triangular) ||
  + (col < row && !lower_triangular)) {
  continue;
  }
  