harfbuzz/hb-shape-fuzzer: Use-of-uninitialized-value in hb_font_t::em_scale

Detailed report: https://oss-fuzz.com/testcase?key=5638729035677696 Project: harfbuzz Fuzzer: libFuzzerharfbuzzhb-shape-fuzzer Fuzz target binary: hb-shape-fuzzer Job Type: libfuzzermsanharfbuzz Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: hbfontt::emscale...