OSV-2022-886 Heap-buffer-overflow in SfxEntry::add

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=51242 Crash type: Heap-buffer-overflow READ 1 Crash state: SfxEntry::add AffixMgr::expandrootword SuggestMgr::ngsuggest...