md4c:fuzz-mdhtml: Crash in render_html_escaped

Detailed Report: https://oss-fuzz.com/testcase?key=4641895830650880 Project: md4c Fuzzing Engine: libFuzzer Fuzz Target: fuzz-mdhtml Job Type: libfuzzerubsanmd4c Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x000001f55000 Crash State: renderhtmlescaped textcallback mdprocessinlines...