fix some anti pattern stuff

extra_modules/ensureExists.js

@@ -8,13 +8,13 @@ import {mkdir} from "fs"
  * @return {undefined}                          see: callback
  */
  function ensureExists(path, mask, cb) {
-    if (typeof mask == 'function') { // Allow the `mask` parameter to be optional
+    if (typeof mask === 'function') { // Allow the `mask` parameter to be optional
         cb = mask;
         mask = 0o744;
     }
     mkdir(path, mask, function (err) {
         if (err) {
-            if (err.code == 'EEXIST')
+            if (err.code === 'EEXIST')
                 cb(null); // Ignore the error if the folder already exists
             else
                 cb(err); // Something else went wrong

extra_modules/getip.js

@@ -7,7 +7,7 @@ const config = JSON.parse(fs.readFileSync("server_config.json"));
  */
 function getIP(req) {
     let ip = req.socket.remoteAddress;
-    if (req.headers[config.preferred_ip_header] != undefined && ip == config.only_prefer_when_ip)
+    if (req.headers[config.preferred_ip_header] !== undefined && ip === config.only_prefer_when_ip)
         ip = req.headers[config.preferred_ip_header];
     return ip;
 }