add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/tty/n_null.c
..
..
@@ -20,7 +20,8 @@
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 }
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 static ssize_t n_null_read(struct tty_struct *tty, struct file *file,
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-			   unsigned char __user * buf, size_t nr)
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+			   unsigned char *buf, size_t nr,
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+			   void **cookie, unsigned long offset)
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 {
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 	return -EOPNOTSUPP;
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 }