poppler/pdf_fuzzer: Use-of-uninitialized-value in Splash::fillGlyph2

Detailed report: https://oss-fuzz.com/testcase?key=5830388655063040 Project: poppler Fuzzer: libFuzzerpopplerpdffuzzer Fuzz target binary: pdffuzzer Job Type: libfuzzermsanpoppler Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: Splash::fillGlyph2...