mdns: Update copyright header

components/mdns/mdns.c

@@ -1,16 +1,8 @@
-// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
-//
-// 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.
+/*
+ * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 
 #include "mdns.h"
 #include "mdns_private.h"

tools/ci/check_copyright_ignore.txt

@@ -1983,7 +1983,6 @@ components/mdns/host_test/components/freertos_linux/queue_unique_ptr.hpp
 components/mdns/host_test/main/main.c
 components/mdns/include/mdns.h
 components/mdns/include/mdns_console.h
-components/mdns/mdns.c
 components/mdns/mdns_console.c
 components/mdns/mdns_networking_lwip.c
 components/mdns/mdns_networking_socket.c