OSV-2021-229 Heap-buffer-overflow in cram_xpack_decode_init

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29827 Crash type: Heap-buffer-overflow WRITE 4 Crash state: cramxpackdecodeinit cramdecoderinit cramdecodecompressionheader...