OSV-2022-1144 Heap-buffer-overflow in onigenc_mbn_mbc_case_fold

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=53041 Crash type: Heap-buffer-overflow READ 1 Crash state: onigencmbnmbccasefold euckrmbccasefold matchat...