graphicsmagick/coder_PTIF_fuzzer: Use-of-uninitialized-value in ExportGrayQuantumType

Project: http://hg.code.sf.net/p/graphicsmagick/code Detailed report: https://oss-fuzz.com/testcase?key=5702333384622080 Project: graphicsmagick Fuzzer: libFuzzercoderPTIFfuzzer Fuzz target binary: coderPTIFfuzzer Job Type: libfuzzermsangraphicsmagick Platform Id: linux Crash Type:...