Bluetooth: btuart-cs: Remove empty destruct cb

The destruct callback is optional and we provide an empty callback so
remove it.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/drivers/bluetooth/btuart_cs.c b/drivers/bluetooth/btuart_cs.c
index 200b3a2..84e02f1 100644
--- a/drivers/bluetooth/btuart_cs.c
+++ b/drivers/bluetooth/btuart_cs.c
@@ -459,11 +459,6 @@
 }
 
 
-static void btuart_hci_destruct(struct hci_dev *hdev)
-{
-}
-
-
 static int btuart_hci_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
 {
 	return -ENOIOCTLCMD;
@@ -505,7 +500,6 @@
 	hdev->close    = btuart_hci_close;
 	hdev->flush    = btuart_hci_flush;
 	hdev->send     = btuart_hci_send_frame;
-	hdev->destruct = btuart_hci_destruct;
 	hdev->ioctl    = btuart_hci_ioctl;
 
 	hdev->owner = THIS_MODULE;