chore: fixed variable name

src/routes/reviews.router.ts

@@ -37,11 +37,11 @@ reviewsRouter.post('/', async (req: Request, res: Response) => {
       throw error.details[0].message
     }
 
-    const reviews = await collections.reviews?.findOne({
+    const existingReview = await collections.reviews?.findOne({
       eventId: review.eventId
     })
 
-    if (reviews) {
+    if (existingReview) {
       throw new Error('review with provided "eventId" exists')
     }