TTY: switch tty_insert_flip_string

Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty in many
call sites. Only tty_port will needed and hence no more
tty_port_tty_get in those paths.

tty_insert_flip_string this time.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/isdn/i4l/isdn_common.h b/drivers/isdn/i4l/isdn_common.h
index 9a471f6..2260ef0 100644
--- a/drivers/isdn/i4l/isdn_common.h
+++ b/drivers/isdn/i4l/isdn_common.h
@@ -37,7 +37,7 @@
 extern void isdn_unexclusive_channel(int di, int ch);
 extern int isdn_getnum(char **);
 extern int isdn_readbchan(int, int, u_char *, u_char *, int, wait_queue_head_t *);
-extern int isdn_readbchan_tty(int, int, struct tty_struct *, int);
+extern int isdn_readbchan_tty(int, int, struct tty_port *, int);
 extern int isdn_get_free_channel(int, int, int, int, int, char *);
 extern int isdn_writebuf_skb_stub(int, int, int, struct sk_buff *);
 extern int register_isdn(isdn_if *i);