graphicsmagick/coder_PCX_fuzzer: Use-of-uninitialized-value in IsMonochromeImage

Project: http://hg.code.sf.net/p/graphicsmagick/code Detailed report: https://oss-fuzz.com/testcase?key=5925765016190976 Project: graphicsmagick Fuzzer: libFuzzergraphicsmagickcoderPCXfuzzer Fuzz target binary: coderPCXfuzzer Job Type: libfuzzermsangraphicsmagick Platform Id: linux Crash Type:...