mpg123/read_fuzzer: Use-of-uninitialized-value in handle_apetag

Detailed report: https://oss-fuzz.com/testcase?key=5709457541038080 Project: mpg123 Fuzzer: libFuzzermpg123readfuzzer Fuzz target binary: readfuzzer Job Type: libfuzzermsanmpg123 Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: handleapetag wetwork...