libjpeg-turbo:compress12_fuzzer: Use-of-uninitialized-value in encode_mcu_AC_first

Detailed Report: https://oss-fuzz.com/testcase?key=5071676943958016 Project: libjpeg-turbo Fuzzing Engine: libFuzzer Fuzz Target: compress12fuzzer Job Type: libfuzzermsanlibjpeg-turbo Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: encodemcuACfirst...