drivers/char/n_tty.c misannotated prototype

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/n_tty.c

@@ -1183,7 +1183,7 @@ static int copy_from_read_buf(struct tty_struct *tty,
 	return retval;
 }
 
-extern ssize_t redirected_tty_write(struct file *, const char *,
+extern ssize_t redirected_tty_write(struct file *, const char __user *,
 							size_t, loff_t *);
 
 /**