graphicsmagick:coder_BIGTIFF_fuzzer: Use-of-uninitialized-value in DisassociateAlphaRegion

Detailed Report: https://oss-fuzz.com/testcase?key=5842416771661824 Project: graphicsmagick Fuzzing Engine: libFuzzer Fuzz Target: coderBIGTIFFfuzzer Job Type: libfuzzermsangraphicsmagick Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: DisassociateAlphaRegion...