unrar/unrar_fuzzer: Use-of-uninitialized-value in Archive::ConvertFileHeader

Detailed report: https://oss-fuzz.com/testcase?key=5344878679556096 Project: unrar Fuzzer: libFuzzerunrarfuzzer Fuzz target binary: unrarfuzzer Job Type: libfuzzermsanunrar Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: Archive::ConvertFileHeader...