udev: drop license boilerplate

src/udev/udev-ctrl.c

@@ -1,12 +1,4 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later
- *
- * libudev - interface to udev device information
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <errno.h>
 #include <poll.h>