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/synclink_gt.c b/drivers/tty/synclink_gt.c
index 62a0db7..473d740 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -1893,10 +1893,8 @@
 				else if (status & BIT0)
 					stat = TTY_FRAME;
 			}
-			if (tty) {
-				tty_insert_flip_char(tty, ch, stat);
-				chars++;
-			}
+			tty_insert_flip_char(&info->port, ch, stat);
+			chars++;
 		}
 
 		if (i < count) {
@@ -2182,7 +2180,7 @@
 			if (info->port.tty) {
 				if (!(status & info->ignore_status_mask)) {
 					if (info->read_status_mask & MASK_BREAK) {
-						tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
+						tty_insert_flip_char(&info->port, 0, TTY_BREAK);
 						if (info->port.flags & ASYNC_SAK)
 							do_SAK(info->port.tty);
 					}