structure: BStringTrie: fix integer overflow when casting size_t to int
structure: BStringTrie: fix integer overflow when casting size_t to int

DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn,DavidCox1979/badvpn