openvpn: interactive.c: Fix potential stack overflow issue https://github.com/OpenVPN/openvpn/commit/989b22cb6e007fd1addcfaf7d12f4fec9fbc9639 CREATE(Triage):(User=admin) CVE-2024-27459 (https://nvd.nist.gov/vuln/detail/CVE-2024-27459)