OSV-2021-543 Heap-use-after-free in dxf_objects_read

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32275 Crash type: Heap-use-after-free READ 2 Crash state: dxfobjectsread dwgreaddxf llvmfuzz.c...