Yisen Zhuang eb570862a2 net/hns3: reduce judgements of free Tx ring space
This patch reduces the number of the judgement of the free Tx ring space
in the 'tx_pkt_burst' ops implementation function to avoid performance
loss. According to hardware constraints, we need to reserve a Tx Buffer
Descriptor in the TX ring in hns3 network engine.

Signed-off-by: Yisen Zhuang <yisen.zhuang@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
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