graphicsmagick/coder_VIFF_fuzzer: Use-of-uninitialized-value in ThresholdImage

Project: http://hg.code.sf.net/p/graphicsmagick/code Detailed report: https://oss-fuzz.com/testcase?key=4975558724157440 Project: graphicsmagick Fuzzer: libFuzzergraphicsmagickcoderVIFFfuzzer Fuzz target binary: coderVIFFfuzzer Job Type: libfuzzermsangraphicsmagick Platform Id: linux Crash Type:...