add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/wan/hdlc_ppp.c
..
..
@@ -1,12 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Generic HDLC support routines for Linux
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  * Point-to-point protocol support
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  *
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  * Copyright (C) 1999 - 2008 Krzysztof Halasa <khc@pm.waw.pl>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of version 2 of the GNU General Public License
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- * as published by the Free Software Foundation.
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  */
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 #include <linux/errno.h>