OSV-2021-838 Heap-use-after-free in multiline_parser_conf_file

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34960 Crash type: Heap-use-after-free READ 8 Crash state: multilineparserconffile flbparserconffile configfuzzer.c...