Bluetooth: Fix warning: variable 'tty' set but not used

The patch below fixes a warning message when using gcc 4.6.0.

  CC [M]  drivers/bluetooth/hci_ldisc.o
drivers/bluetooth/hci_ldisc.c: In function 'hci_uart_send_frame':
drivers/bluetooth/hci_ldisc.c:213:21: warning: variable 'tty' set but not used
Signed-off-by: NJustin P. Mattock <justinmattock@gmail.com>
Reviewed-By: NGustavo F. Padovan <gustavo@padovan.org>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_ldisc.c

@@ -210,7 +210,6 @@ static int hci_uart_close(struct hci_dev *hdev)
 static int hci_uart_send_frame(struct sk_buff *skb)
 {
 	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
-	struct tty_struct *tty;
 	struct hci_uart *hu;
 
 	if (!hdev) {
@@ -222,7 +221,6 @@ static int hci_uart_send_frame(struct sk_buff *skb)
 		return -EBUSY;
 
 	hu = (struct hci_uart *) hdev->driver_data;
-	tty = hu->tty;
 
 	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);