OSV-2020-1802 Heap-buffer-overflow in cli_codepage_to_utf8

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21960 Crash type: Heap-buffer-overflow READ Crash state: clicodepagetoutf8 clivbareaddirnew clivbascandirnew...