mruby:mruby_fuzzer: Use-of-uninitialized-value in mpz_add

Project: https://github.com/mruby/mruby.git Detailed Report: https://oss-fuzz.com/testcase?key=6099098936868864 Project: mruby Fuzzing Engine: libFuzzer Fuzz Target: mrubyfuzzer Job Type: libfuzzermsanmruby Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: mpza...