[TTY]: Use tty_mode_ioctl() in network drivers.

We conciously make a change here - we permit mode and speed setting to
be done in things like SLIP mode. There isn't actually a technical
reason to disallow this. It's usually a silly thing to do but we can
do it and soemone might wish to do so.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/irda/irtty-sir.c b/drivers/net/irda/irtty-sir.c
index 2c6f7be..fc753d7 100644
--- a/drivers/net/irda/irtty-sir.c
+++ b/drivers/net/irda/irtty-sir.c
@@ -434,11 +434,6 @@
 	IRDA_ASSERT(dev != NULL, return -1;);
 
 	switch (cmd) {
-	case TCGETS:
-	case TCGETA:
-		err = n_tty_ioctl(tty, file, cmd, arg);
-		break;
-
 	case IRTTY_IOCTDONGLE:
 		/* this call blocks for completion */
 		err = sirdev_set_dongle(dev, (IRDA_DONGLE) arg);
@@ -454,7 +449,7 @@
 			err = -EFAULT;
 		break;
 	default:
-		err = -ENOIOCTLCMD;
+		err = tty_mode_ioctl(tty, file, cmd, arg);
 		break;
 	}
 	return err;