imagemagick:encoder_heic_fuzzer: Use-of-uninitialized-value in Box_prfr::write

Project: https://github.com/imagemagick/imagemagick.git Detailed Report: https://oss-fuzz.com/testcase?key=4713306517733376 Project: imagemagick Fuzzing Engine: libFuzzer Fuzz Target: encoderheicfuzzer Job Type: libfuzzermsanimagemagick Platform Id: linux Crash Type: Use-of-uninitialized-value...