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.c b/drivers/tty/synclink.c
index d42b661..33656b3 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -1507,13 +1507,13 @@
 			else if (status & RXSTATUS_FRAMING_ERROR)
 				flag = TTY_FRAME;
 		}	/* end of if (error) */
-		tty_insert_flip_char(tty, DataByte, flag);
+		tty_insert_flip_char(&info->port, DataByte, flag);
 		if (status & RXSTATUS_OVERRUN) {
 			/* Overrun is special, since it's
 			 * reported immediately, and doesn't
 			 * affect the current character
 			 */
-			work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+			work += tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
 		}
 	}