libchewing: Negative-size-param in _Inner_InternalSpecialSymbol

Project: https://github.com/chewing/libchewing.git Detailed report: https://clusterfuzz-external.appspot.com/testcase?key=5836280051007488 Fuzzer: libFuzzerlibchewingchewingdynamicconfigfuzzer Job Type: libfuzzerasanlibchewing Platform Id: linux Crash Type: Negative-size-param Crash Address: Cras...