lzma/xzenc_fuzzer: Use-of-uninitialized-value in SzAlloc

Detailed report: https://oss-fuzz.com/testcase?key=5689516553142272 Project: lzma Fuzzer: libFuzzerlzmaxzencfuzzer Fuzz target binary: xzencfuzzer Job Type: libfuzzermsanlzma Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: SzAlloc LzmaAlloc AllocRefs Sanitize...