TTY: switch tty_insert_flip_char

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_char is the next one to proceed. This one is used all
over the code, so the patch is huge.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/s390/char/keyboard.h b/drivers/s390/char/keyboard.h
index d0ae2be..acab28d 100644
--- a/drivers/s390/char/keyboard.h
+++ b/drivers/s390/char/keyboard.h
@@ -46,7 +46,7 @@
 	struct tty_struct *tty = tty_port_tty_get(port);
 	if (!tty)
 		return;
-	tty_insert_flip_char(tty, ch, 0);
+	tty_insert_flip_char(port, ch, 0);
 	tty_schedule_flip(tty);
 	tty_kref_put(tty);
 }
@@ -58,7 +58,7 @@
 	if (!tty)
 		return;
 	while (*cp)
-		tty_insert_flip_char(tty, *cp++, 0);
+		tty_insert_flip_char(port, *cp++, 0);
 	tty_schedule_flip(tty);
 	tty_kref_put(tty);
 }