libchewing: Heap-use-after-free in GetUint16

Detailed report: https://oss-fuzz.com/testcase?key=5670366873649152 Project: libchewing Fuzzer: libFuzzerchewingdynamicconfigfuzzer Job Type: libfuzzerasanlibchewing Platform Id: linux Crash Type: Heap-use-after-free READ 1 Crash Address: 0x7fd1dcaf1d00 Crash State: GetUint16 TreeFindPhrase...