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/serial/mux.c b/drivers/tty/serial/mux.c
index e2775b6..83b2168 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -242,8 +242,9 @@
  */
 static void mux_read(struct uart_port *port)
 {
+	struct tty_port *tport = &port->state->port;
 	int data;
-	struct tty_struct *tty = port->state->port.tty;
+	struct tty_struct *tty = tport->tty;
 	__u32 start_count = port->icount.rx;
 
 	while(1) {
@@ -266,7 +267,7 @@
 		if (uart_handle_sysrq_char(port, data & 0xffu))
 			continue;
 
-		tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL);
+		tty_insert_flip_char(tport, data & 0xFF, TTY_NORMAL);
 	}
 	
 	if (start_count != port->icount.rx) {