add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/isdn/mISDN/stack.c
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@@ -1,18 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *
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  * Author	Karsten Keil <kkeil@novell.com>
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  *
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  * Copyright 2008  by Karsten Keil <kkeil@novell.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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  */
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 #include <linux/slab.h>
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@@ -84,8 +75,7 @@
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 			cskb = NULL;
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 	}
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 	read_unlock(&sl->lock);
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-	if (cskb)
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-		dev_kfree_skb(cskb);
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+	dev_kfree_skb(cskb);
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 }
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 static void
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@@ -143,8 +133,7 @@
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 	}
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 out:
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 	mutex_unlock(&st->lmutex);
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-	if (skb)
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-		dev_kfree_skb(skb);
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+	dev_kfree_skb(skb);
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 }
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 static inline int
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@@ -539,7 +528,7 @@
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 		rq.protocol = ISDN_P_NT_S0;
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 		if (dev->Dprotocols & (1 << ISDN_P_NT_E1))
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 			rq.protocol = ISDN_P_NT_E1;
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-		/* fall through */
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+		fallthrough;
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 	case ISDN_P_LAPD_TE:
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 		ch->recv = mISDN_queue_message;
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 		ch->peer = &dev->D.st->own;