rxrpc: Don't send an ACK at the end of service call response transmission

Don't send an IDLE ACK at the end of the transmission of the response to a
service call.  The service end resends DATA packets until the client sends an
ACK that hard-acks all the send data.  At that point, the call is complete.
Signed-off-by: David Howells <dhowells@redhat.com>

net/rxrpc/recvmsg.c

@@ -143,8 +143,6 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call)
 	if (call->state == RXRPC_CALL_CLIENT_RECV_REPLY) {
 		rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, 0, true, false);
 		rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK);
-	} else {
-		rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, 0, false, false);
 	}
 
 	write_lock_bh(&call->state_lock);