ttydev: fix pamc_zilog for tty pointer move

Today's linux-next build (sparc64 defconfig) failed like this:

drivers/serial/sunhv.c: In function `receive_chars':
drivers/serial/sunhv.c:188: error: structure has no member named `tty'
drivers/serial/sunsu.c: In function `receive_chars':
drivers/serial/sunsu.c:314: error: structure has no member named `tty'
drivers/serial/sunsab.c: In function `receive_chars':
drivers/serial/sunsab.c:121: error: structure has no member named `tty'

I applied the following patch (which, again, may not be correct).

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c
index 7e9fa5e..0f3d69b 100644
--- a/drivers/serial/sunzilog.c
+++ b/drivers/serial/sunzilog.c
@@ -329,8 +329,8 @@
 
 	tty = NULL;
 	if (up->port.info != NULL &&		/* Unopened serial console */
-	    up->port.info->tty != NULL)		/* Keyboard || mouse */
-		tty = up->port.info->tty;
+	    up->port.info->port.tty != NULL)	/* Keyboard || mouse */
+		tty = up->port.info->port.tty;
 
 	for (;;) {