Remove unnecessary code; ref #3711

src/vm.c

@@ -1908,12 +1908,8 @@ RETRY_TRY_BLOCK:
           }
           /* call ensure only when we skip this callinfo */
           if (ci[0].ridx == ci[-1].ridx) {
-            mrb_value *org_stbase = mrb->c->stbase;
             while (mrb->c->eidx > ci->epos) {
               ecall_adjust();
-              if (org_stbase != mrb->c->stbase) {
-                stk = mrb->c->stack;
-              }
             }
           }
         }