graphicsmagick:coder_PNM_fuzzer: Use-of-uninitialized-value in SyncImageCallBack

Project: http://hg.code.sf.net/p/graphicsmagick/code Detailed Report: https://oss-fuzz.com/testcase?key=5856373341028352 Project: graphicsmagick Fuzzing Engine: libFuzzer Fuzz Target: coderPNMfuzzer Job Type: libfuzzermsangraphicsmagick Platform Id: linux Crash Type: Use-of-uninitialized-value...