mips: fix OOB issue in DecodeRegListOperand() reported by @felixgr
mips: fix OOB issue in DecodeRegListOperand() reported by @felixgr

AmesianX/capstone,xia0pin9/capstone,fvrmatteo/capstone,bSr43/capstone,xia0pin9/capstone,fvrmatteo/capstone,AmesianX/capstone,bSr43/capstone,AmesianX/capstone,fvrmatteo/capstone,fvrmatteo/capstone,xia0pin9/capstone,bSr43/capstone,AmesianX/capstone,fvrmatteo/capstone,AmesianX/capstone,bSr43/capstone,xia0pin9/capstone,bSr43/capstone,fvrmatteo/capstone,xia0pin9/capstone,fvrmatteo/capstone,AmesianX/capstone,xia0pin9/capstone,xia0pin9/capstone,bSr43/capstone,bSr43/capstone,AmesianX/capstone