OSV-2023-554 Heap-buffer-overflow in OT::CmapSubtable::get_glyph

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=60475 Crash type: Heap-buffer-overflow READ 2 Crash state: OT::CmapSubtable::getglyph bool OT::cmap::acceleratort::getglyphfrom hbotgetnominalglyphs...