karchive:ktar_zst_fuzzer: Use-of-uninitialized-value in QIODevice::read

Detailed Report: https://oss-fuzz.com/testcase?key=6030872209063936 Project: karchive Fuzzing Engine: libFuzzer Fuzz Target: ktarzstfuzzer Job Type: libfuzzermsankarchive Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: QIODevice::read...