*/
 static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard)
 {
-       struct rxrpc_skb_priv *sp;
        unsigned long _skb;
        int tail = call->acks_tail, old_tail;
        int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz);
        while (call->acks_hard < hard) {
                smp_read_barrier_depends();
                _skb = call->acks_window[tail] & ~1;
-               sp = rxrpc_skb((struct sk_buff *) _skb);
                rxrpc_free_skb((struct sk_buff *) _skb);
                old_tail = tail;
                tail = (tail + 1) & (call->acks_winsz - 1);