lzma/7z_fuzzer: Use-of-uninitialized-value in CrcUpdateT8

Detailed report: https://oss-fuzz.com/testcase?key=5695345578737664 Project: lzma Fuzzer: libFuzzerlzma7zfuzzer Fuzz target binary: 7zfuzzer Job Type: libfuzzermsanlzma Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: CrcUpdateT8 CrcCalc SzArExExtract Sanitize...