OSV-2020-1599 Use-of-uninitialized-value in slide_hash

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24820 Crash type: Use-of-uninitialized-value Crash state: slidehash fillwindow deflatefast...

OSV-2020-1598 Use-of-uninitialized-value in longest_match

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24804 Crash type: Use-of-uninitialized-value Crash state: longestmatch deflatefast deflate...