libchewing: Crash in GetUint24

Detailed report: https://clusterfuzz-external.appspot.com/testcase?key=6685048367480832 Fuzzer: libFuzzerchewingdynamicconfigfuzzer Job Type: libfuzzerasanlibchewing Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x00009fff8000 Crash State: GetUint24 TreeFindPhrase FindInterval...