message: code clean in heapex.hpp
diff: @@ -59,9 +59,8 @@ class HeapEx {
  int i = id%num_chunks_;
  // thread safe start
  // std::cout << "free_chunk_checkout start" << tid << std::endl;
  - bool avail = false;
  while (loop_flag_) {
  - avail = ((lower_bits_ & (~higher_bits_)) >> i) & 1;
  + bool avail = ((lower_bits_ & (~higher_bits_)) >> i) & 1;
  if (avail) {
  lower_bits_ &= (~(1u << i));
  *chunk = &chunks_[i];
  