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/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 7c72945..4c6743d 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -425,7 +425,8 @@
 					count++;
 				} else
 					count -= 2;
-				tty_insert_flip_string(tty, raw->inbuf, count);
+				tty_insert_flip_string(&raw->port, raw->inbuf,
+						count);
 				tty_flip_buffer_push(tty);
 				break;
 			}