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>

drivers/tty/serial/cpm_uart/cpm_uart_core.c

@@ -303,7 +303,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
 			}
 #endif
 		      error_return:
-			tty_insert_flip_char(tty, ch, flg);
+			tty_insert_flip_char(tport, ch, flg);
 
 		}		/* End while (i--) */