libass: Attempting free in ass_render_event

Project: https://github.com/libass/libass.git Detailed report: https://clusterfuzz-external.appspot.com/testcase?key=5582267204239360 Project: libass Fuzzer: libFuzzerlibassfuzzer Fuzz target binary: libassfuzzer Job Type: libfuzzerasanlibass Platform Id: linux Crash Type: Attempting free Crash...