mupdf/pdf_fuzzer: Use-of-uninitialized-value in fz_drop_imp

Project: git://git.ghostscript.com/mupdf.git Detailed report: https://oss-fuzz.com/testcase?key=5667955980369920 Project: mupdf Fuzzer: libFuzzermupdfpdffuzzer Fuzz target binary: pdffuzzer Job Type: libfuzzermsanmupdf Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash...