wget2/wget_options_fuzzer: Heap-buffer-overflow in set_char_prefix

Project: https://gitlab.com/gnuwget/wget2.git Detailed report: https://oss-fuzz.com/testcase?key=5704034783068160 Project: wget2 Fuzzer: libFuzzerwget2wgetoptionsfuzzer Fuzz target binary: wgetoptionsfuzzer Job Type: libfuzzerasanwget2 Platform Id: linux Crash Type: Heap-buffer-overflow WRITE 1...