structure: BStringTrie: fix an overflow just introduced, in case int is bigger than size_t
structure: BStringTrie: fix an overflow just introduced, in case int is bigger than size_t

SeReRPRo/badvpn,SeReRPRo/badvpn,SeReRPRo/badvpn,SeReRPRo/badvpn,SeReRPRo/badvpn