OSV-2021-850 Heap-buffer-overflow in proto_item_append_text

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35102 Crash type: Heap-buffer-overflow READ 8 Crash state: protoitemappendtext dissectpfcp3gppenterpriseies calldissectorwork...