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/tty/moxa.c b/drivers/tty/moxa.c
index fcaac48..f42492d 100644
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -1429,7 +1429,7 @@
 		goto put;
 
 	if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
-		tty_insert_flip_char(tty, 0, TTY_BREAK);
+		tty_insert_flip_char(&p->port, 0, TTY_BREAK);
 		tty_schedule_flip(tty);
 	}