If the FEC mode was not supported, it should return error code.
This patch also adds a space when log error info.
Fixes: 9bf2ea8dbc ("net/hns3: support FEC")
Cc: stable@dpdk.org
Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>