net/hns3: fix maximum queues on configuration failure

net/hns3: fix maximum queues on configuration failure

The "cfg_max_queues" maintains configured max queue numbers from user,
and is equal to the maximum of "nb_rx_queues" and "nb_tx_queues" in
"dev->data".

From the ethdev layer framework, "nb_rx/tx_queues" in "dev->data" were set
to zero in rte_eth_dev_configure() if ops.dev_configure in PMD fails to be
executed, In addition, if ops.dev_configure in HNS3 PMD failed, the fake
queues are also cleared on a device that does not support independent Rx/Tx
queues.

Therefore, the "cfg_max_queues" should be also set to zero when
dev_configure fails.

Fixes: fa29fe45a7b4 ("net/hns3: support queue start and stop")
Cc: stable@dpdk.org
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>