graphicsmagick/coder_MAT_fuzzer: Use-of-uninitialized-value in WriteBlob

Project: http://hg.code.sf.net/p/graphicsmagick/code Detailed report: https://oss-fuzz.com/testcase?key=5710480829054976 Project: graphicsmagick Fuzzer: libFuzzergraphicsmagickcoderMATfuzzer Fuzz target binary: coderMATfuzzer Job Type: libfuzzermsangraphicsmagick Platform Id: linux Crash Type:...