imagemagick:encoder_heic_fuzzer: Use-of-uninitialized-value in put_weighted_pred_avg_16_fallback

Detailed Report: https://oss-fuzz.com/testcase?key=5683020281937920 Project: imagemagick Fuzzing Engine: libFuzzer Fuzz Target: encoderheicfuzzer Job Type: libfuzzermsanimagemagick Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: putweightedpredavg16fallback...