OSV-2022-1259 Heap-buffer-overflow in dwg_decode_INSERT_private

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=54228 Crash type: Heap-buffer-overflow READ 1 Crash state: dwgdecodeINSERTprivate dwgdecodeINSERT dwgdecodeaddobject...