message: fix submatrix extraction warning
diff: @@ -1070,7 +1070,8 @@ __global__
  auto res_nnz = result_row_ptrs[res_row];
  for (auto nnz = source_row_ptrs[src_row];
  nnz < source_row_ptrs[src_row + 1]; ++nnz) {
  - const auto res_col = source_col_idxs[nnz] - col_offset;
  + const auto res_col =
  + source_col_idxs[nnz] - static_cast<IndexType>(col_offset);
  if (res_col < num_cols && res_col >= 0) {
  result_col_idxs[res_nnz] = res_col;
  result_values[res_nnz] = source_values[nnz];
  