Fix exit

src/codegen.c

@@ -355,7 +355,7 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
 static void
 scope_error(codegen_scope *s)
 {
-  exit(1);
+  exit(EXIT_FAILURE);
 }
 
 static inline void

test/init_mrbtest.c

@@ -18,7 +18,7 @@ mrb_init_mrbtest(mrb_state *mrb)
 #endif
   if (mrb->exc) {
     mrb_p(mrb, mrb_obj_value(mrb->exc));
-    exit(0);
+    exit(EXIT_FAILURE);
   }
 }