suite: fix an compilation warning reported by MSVC on test_arm_regression.c
suite: fix an compilation warning reported by MSVC on test_arm_regression.c

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