net/hns3: ignore devargs parsing return

net/hns3: ignore devargs parsing return

In hns3 PMD, as the handler always return 0, the return value
of a function 'rte_kvargs_process' no need to be checked. But
the API definition has return value, so 'void' could be used
to ignore that.

Fixes: a124f9e9591b ("net/hns3: add runtime config to select IO burst function")

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>