harfbuzz: Use-of-uninitialized-value in hb_buffer_t::set_cluster

Project: https://github.com/harfbuzz/harfbuzz.git Detailed report: https://oss-fuzz.com/testcase?key=5617496443846656 Project: harfbuzz Fuzzer: libFuzzerharfbuzzhb-fuzzer Fuzz target binary: hb-fuzzer Job Type: libfuzzermsanharfbuzz Platform Id: linux Crash Type: Use-of-uninitialized-value Crash...