review: simplify message emission

Signed-off-by: mathetake <takeshi@tetrate.io>

Author: mathetake

src/v8/v8.cc

@@ -604,8 +604,8 @@ void V8::getModuleFunctionImpl(std::string_view function_name,
     SaveRestoreContext saved_context(context);
     auto trap = func->call(params, nullptr);
     if (trap) {
-      auto message = this->getFailMessage(std::string(function_name), std::move(trap));
-      fail(FailState::RuntimeError, message);
+      fail(FailState::RuntimeError,
+           this->getFailMessage(std::string(function_name), std::move(trap)));
     }
   };
 }
@@ -632,8 +632,8 @@ void V8::getModuleFunctionImpl(std::string_view function_name,
     SaveRestoreContext saved_context(context);
     auto trap = func->call(params, results);
     if (trap) {
-      auto message = this->getFailMessage(std::string(function_name), std::move(trap));
-      fail(FailState::RuntimeError, message);
+      fail(FailState::RuntimeError,
+           this->getFailMessage(std::string(function_name), std::move(trap)));
       return R{};
     }
     R rvalue = results[0].get<typename ConvertWordTypeToUint32<R>::type>();