message: Fixed logic error in MslControl for Issue 280
diff: @@ -1943,7 +1943,7 @@ private:
  // If the maximum message count was hit or if there is no new
  // response then return the original error response.
  - if (maxMessagesHit || (newChannel && newChannel->input()))
  + if (maxMessagesHit || (newChannel && !(newChannel->input())))
  return make_shared<MslChannel>(response, nullptr);
  // Return the new channel, which may contain an error or be
  