cleanup (unused param)

platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/UpdateChecker.kt

@@ -1,17 +1,5 @@
 /*
- * Copyright 2000-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
  */
 package com.intellij.openapi.updateSettings.impl
 
@@ -438,7 +426,7 @@ object UpdateChecker {
   }
 
   private fun showNotification(project: Project?, message: String, action: () -> Unit, notificationType: NotificationUniqueType) {
-    val listener = NotificationListener { notification, event ->
+    val listener = NotificationListener { notification, _ ->
       notification.expire()
       action.invoke()
     }