OSV-2024-1272 Segv on unknown address in std::__1::ios_base::~ios_base

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=371292576 Crash type: Segv on unknown address Crash state: std::1::iosbase::iosbase Poco::Net::MultipartReader::nextPart Poco::Net::MailMessage::readMultipart...