OSV-2020-1549 UNKNOWN WRITE in hb_vector_t<CFF::op_str_t>::resize

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24500 Crash type: UNKNOWN WRITE Crash state: hbvectort::resize hbvectort::push CFF::parsedvaluest::addop...