imagemagick/encoder_six_fuzzer: Crash in sixel_decode

Project: https://github.com/imagemagick/imagemagick.git Detailed report: https://oss-fuzz.com/testcase?key=4510716162736128 Project: imagemagick Fuzzer: aflimagemagickencodersixfuzzer Fuzz target binary: encodersixfuzzer Job Type: aflasanimagemagick Platform Id: linux Crash Type: UNKNOWN WRITE...