Correct VCH sign flag comparison on -32768.
Correct VCH sign flag comparison on -32768.

mupen64plus/mupen64plus-rsp-cxd4,8l/rsp,8l/rsp,8l/rsp,mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4