load_exec() no longer return fixnum value for no_exec; should close #1569

src/parse.y

@@ -5381,7 +5381,7 @@ load_exec(mrb_state *mrb, parser_state *p, mrbc_context *c)
   if (proc == NULL) {
     static const char msg[] = "codegen error";
     mrb->exc = mrb_obj_ptr(mrb_exc_new(mrb, E_SCRIPT_ERROR, msg, sizeof(msg) - 1));
-    return mrb_nil_value();
+    return mrb_undef_value();
   }
   if (c) {
     if (c->dump_result) codedump_all(mrb, proc);

tools/mrbc/mrbc.c

@@ -212,11 +212,10 @@ load_file(mrb_state *mrb, struct mrbc_args *args)
 
   result = mrb_load_file_cxt(mrb, infile, c);
   if (need_close) fclose(infile);
-  if (mrb_undef_p(result) || mrb_fixnum(result) < 0) {
   mrbc_context_free(mrb, c);
+  if (mrb_undef_p(result)) {
     return mrb_nil_value();
   }
-  mrbc_context_free(mrb, c);
   return result;
 }