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

This patch fixes a double-free spotted by the Coverity checker.

Signed-off-by: Adrian Bunk <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/bluetooth/btsdio.c

···
 	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);