nvme-fabrics: unset write/poll queues for discovery controllers

Even if user-space sent it to us, it got it wrong so lets
help by disallowing it.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/fabrics.c

@@ -874,6 +874,8 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 	if (opts->discovery_nqn) {
 		opts->kato = 0;
 		opts->nr_io_queues = 0;
+		opts->nr_write_queues = 0;
+		opts->nr_poll_queues = 0;
 		opts->duplicate_connect = true;
 	}
 	if (ctrl_loss_tmo < 0)