Cargo clippy

src/controllers/openid_controller.rs

@@ -309,7 +309,7 @@ pub async fn token(req: HttpRequest,
                 }
             }
 
-            if let Some(_) = session.access_token {
+            if session.access_token.is_some() {
                 return Ok(error_response(&query, "invalid_request", "Authorization code already used!"));
             }