OSV-2020-2251 Heap-buffer-overflow in blosc_run_decompression_with_context

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28392 Crash type: Heap-buffer-overflow READ 1 Crash state: bloscrundecompressionwithcontext blosc2decompressctx framedecompresschunk...