qpdf/dct_fuzzer: Use-of-uninitialized-value in ycck_cmyk_convert

Project: https://github.com/qpdf/qpdf.git Detailed report: https://oss-fuzz.com/testcase?key=5632990870241280 Project: qpdf Fuzzer: libFuzzerqpdfdctfuzzer Fuzz target binary: dctfuzzer Job Type: libfuzzermsanqpdf Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State...