Bluetooth: hci_uart: Remove unused h4->rx_skb field

The h4->rx_skb is not used anymore and with that just remove it. Seems
this was a leftover and even the kfree_skb call freeing it is rather
pointless since it got never allocated.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

drivers/bluetooth/hci_h4.c

@@ -51,7 +51,6 @@
 struct h4_struct {
 	unsigned long rx_state;
 	unsigned long rx_count;
-	struct sk_buff *rx_skb;
 	struct sk_buff_head txq;
 };
 
@@ -95,8 +94,6 @@ static int h4_close(struct hci_uart *hu)
 
 	skb_queue_purge(&h4->txq);
 
-	kfree_skb(h4->rx_skb);
-
 	hu->priv = NULL;
 	kfree(h4);