imagemagick/encoder_png32_fuzzer: Use-of-uninitialized-value in ScaleQuantumToChar

Detailed report: https://oss-fuzz.com/testcase?key=6272571728199680 Project: imagemagick Fuzzer: libFuzzerimagemagickencoderpng32fuzzer Fuzz target binary: encoderpng32fuzzer Job Type: libfuzzermsanimagemagick Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State:...