OSV-2020-509 Use-of-uninitialized-value in hb_hashmap_t<hb_serialize_context_t::object_t const*, unsigned int,

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14641 Crash type: Use-of-uninitialized-value Crash state: hbhashmapthbserializecontextt::objectt const, unsigned int, hbhashmapthbserializecontextt::objectt const, unsigned int, hbhashmapthbserializecontextt::objectt const,...