vm.c: resolve `int` and `mrb_int` mixture.
@@ -547,7 +547,7 @@ mrb_value
mrb_exec_irep(mrb_state *mrb, mrb_value self, struct RProc *p, mrb_func_t posthook)
{
mrb_callinfo *ci = mrb->c->ci;
- mrb_int keep, nregs;
+ int keep, nregs;
ci->stack[0] = self;
mrb_vm_ci_proc_set(ci, p);
