chore(deps): update dependency @types/hapi__joi to v16.0.9 (#3185)

packages/netlify-cms-proxy-server/package.json

@@ -32,7 +32,7 @@
   "devDependencies": {
     "@types/cors": "^2.8.6",
     "@types/express": "^4.17.2",
-    "@types/hapi__joi": "16.0.6",
+    "@types/hapi__joi": "16.0.9",
     "@types/jest": "^24.9.0",
     "@types/morgan": "^1.7.37",
     "@types/node": "^13.1.7",

packages/netlify-cms-proxy-server/src/middlewares/joi/index.ts

@@ -190,13 +190,11 @@ export const joi = (schema: Joi.Schema) => (
   next: express.NextFunction,
 ) => {
   const { error } = schema.validate(req.body, { allowUnknown: true });
-  const valid = error == null;
-
-  if (valid) {
-    next();
-  } else {
+  if (error) {
     const { details } = error;
     const message = details.map(i => i.message).join(',');
     res.status(422).json({ error: message });
+  } else {
+    next();
   }
 };