message: refactor: Avoid recursive locking in CAddrMan::size
diff: @@ -362,7 +362,7 @@ void CAddrMan::Attempt_(const CService& addr, bool fCountFailure, int64_t nTime)
  CAddrInfo CAddrMan::Select_(bool newOnly)
  {
  - if (size() == 0)
  + if (vRandom.empty())
  return CAddrInfo();
  if (newOnly && nNew == 0)
  