bug happens when enable zero_worm has fixed

[MKrbm]

• It was due to non-initialized integer : leg_size. This happens when flip is 0 and skip the code with goto statement.

  } else {
    leg_size = opsp->size(); //Added this part
    tmp--;
    nindex = tmp / (sps - 1);
    if (warped) {
      if (fl != 0) {
        throw std::runtime_error("fl must be zero when warp_label is called");
      }
      sign *= loperators[op_type].signs[opsp->state()];
    }
    fl = tmp % (sps - 1) + 1;
    state_num = opsp->update_state(nindex, fl);
    sign *= loperators[op_type].signs[state_num];
    dir = nindex / (leg_size);
    site = opsp->bond(nindex % leg_size);
    dout << "nindex, leg_size, dir, site : " << nindex << " " << leg_size
         << " " << dir << " " << site << std::endl;
    if (warped) {
      next_dot = opsp->next_dot(0, nindex, cur_dot);
      tau_prime = opsp->tau();
    } else {
      next_dot = opsp->next_dot(cindex, nindex, cur_dot);
    }
    if (!loperators[op_type].has_warp(state_num)) {
      can_warp_ops.erase(cur_dot - dotp->index());
    } else {
      can_warp_ops.insert(cur_dot - dotp->index());
    }
  }

It's better to get rid of goto statement later.