message: dcsctp: Add more consistency checks
  When there is no outstanding data, then next TSN to allocate should
  always be one more than what the client has last ACKed.
  Cr-Commit-Position: refs/heads/main@{#35016}
diff: @@ -108,6 +108,11 @@ bool RetransmissionQueue::IsConsistent() const {
  }
  }
  + if (outstanding_data_.empty() &&
  + next_tsn_ != last_cumulative_tsn_ack_.next_value()) {
  + return false;
  + }
  +
  return actual_outstanding_bytes == outstanding_bytes_ &&
  actual_outstanding_items == outstanding_items_ &&
  actual_to_be_retransmitted == to_be_retransmitted_;
  