Fix compile errors in SGI console drivers (linux-next tree)

The below is the patch to replace blindly all possible places,
including Jack's fixes.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
(Reviewed and checked rather than blindly added)
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/mux.c b/drivers/serial/mux.c
index e940317..953a5ff 100644
--- a/drivers/serial/mux.c
+++ b/drivers/serial/mux.c
@@ -243,7 +243,7 @@
 static void mux_read(struct uart_port *port)
 {
 	int data;
-	struct tty_struct *tty = port->info->tty;
+	struct tty_struct *tty = port->info->port.tty;
 	__u32 start_count = port->icount.rx;
 
 	while(1) {