libreoffice/hwpfuzzer: Negative-size-param in HMemIODev::readBlock

Project: git://anongit.freedesktop.org/libreoffice/core Detailed report: https://oss-fuzz.com/testcase?key=4891144551923712 Project: libreoffice Fuzzer: libFuzzerlibreofficehwpfuzzer Fuzz target binary: hwpfuzzer Job Type: libfuzzerasanlibreoffice Platform Id: linux Crash Type: Negative-size-para...