file/magic_fuzzer: Use-of-uninitialized-value in mprint

Detailed report: https://oss-fuzz.com/testcase?key=5634761748381696 Project: file Fuzzer: libFuzzerfilemagicfuzzer Fuzz target binary: magicfuzzer Job Type: libfuzzermsanfile Platform Id: linux Crash Type: Use-of-uninitialized-value Crash Address: Crash State: mprint match filesoftmagic Sanitizer...