rxrpc: Fix call leak

When retransmitting a packet, rxrpc_resend() shouldn't be attaching a ref
to the call to the txbuf as that pins the call and prevents the call from
clearing the packet buffer.

Signed-off-by: David Howells <dhowells@redhat.com>
Fixes: d57a3a1 ("rxrpc: Save last ACK's SACK table rather than marking txbufs")
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

net/rxrpc/call_event.c

@@ -198,7 +198,6 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
 
 			if (list_empty(&txb->tx_link)) {
 				rxrpc_get_txbuf(txb, rxrpc_txbuf_get_retrans);
-				rxrpc_get_call(call, rxrpc_call_got_tx);
 				list_add_tail(&txb->tx_link, &retrans_queue);
 				set_bit(RXRPC_TXBUF_RESENT, &txb->flags);
 			}