ack.bufferSize should be set to 0 when generating an ack.
Fixes: 8d94aa381dab ("rxrpc: Calls shouldn't hold socket refs")
Reported-by: Jeffrey Altman <jaltman@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
        *_hard_ack = hard_ack;
        *_top = top;
 
-       pkt->ack.bufferSpace    = htons(8);
+       pkt->ack.bufferSpace    = htons(0);
        pkt->ack.maxSkew        = htons(0);
        pkt->ack.firstPacket    = htonl(hard_ack + 1);
        pkt->ack.previousPacket = htonl(call->ackr_highest_seq);