OSV-2022-872 Stack-buffer-overflow in PfxEntry::test_condition

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=51134 Crash type: Stack-buffer-overflow READ 1 Crash state: PfxEntry::testcondition PfxEntry::checkword AffixMgr::prefixcheck...