fix: /v2ex/tab/hot returned undefined (#6461)

lib/routes/v2ex/tab.js

@@ -39,7 +39,7 @@ module.exports = async (ctx) => {
                         return `<p><div>#${no}: <i>${author}</i></div><div>${content}</div></p>`;
                     })
                     .join('');
-                const post = {
+                post = {
                     title: $('.header h1').text(),
                     link: pageUrl,
                     guid: pageUrl,