net: hns3: add protection when get SFP speed as 0
In some case, the MAC speed get from hardware maybe 0, it should not be set to mac->speed. Signed-off-by: Guojia Liao <liaoguojia@huawei.com> Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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