poppler/pdf_fuzzer: Use-of-uninitialized-value in splashOutBlendDarken

Project: https://anongit.freedesktop.org/git/poppler/poppler.git Detailed report: https://oss-fuzz.com/testcase?key=5151581400989696 Project: poppler Fuzzer: libFuzzerpopplerpdffuzzer Fuzz target binary: pdffuzzer Job Type: libfuzzermsanpoppler Platform Id: linux Crash Type:...