drivers/bluetooth/btsdio.c: fix double-free

This patch fixes a double-free spotted by the Coverity checker.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/bluetooth/btsdio.c

@@ -162,10 +162,8 @@ static int btsdio_rx_packet(struct btsdio_data *data)
 	bt_cb(skb)->pkt_type = hdr[3];
 
 	err = hci_recv_frame(skb);
-	if (err < 0) {
-		kfree(skb);
+	if (err < 0)
 		return err;
-	}
 
 	sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);