vm.go
func cleanupVM(v *VM) {
	if v.handle != C.VIX_INVALID_HANDLE {
		C.Vix_ReleaseHandle(v.handle)
		v.handle = C.VIX_INVALID_HANDLE
	}
}
func cleanupVM(v *VM) {
	if v.handle != C.VIX_INVALID_HANDLE {
		C.Vix_ReleaseHandle(v.handle)
		v.handle = C.VIX_INVALID_HANDLE
	}
}
// cleanupVM cleans up VM VIX handle.