net: hns3: add nic_client check when initialize roce base information

Roce driver works base on HNS3 driver.If insmod Roce driver before
NIC driver there is a error because do not check nic_client. This patch
adds nic_client check when initialize roce base information.

Fixes: 46a3df9f

 (net: hns3: Add HNS3 Acceleration Engine & Compatibility Layer Support)

Signed-off-by: Lipeng <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>