RDMA/hns: Logic optimization of wc_flags

We should set IB_WC_WITH_VLAN only when VLAN is enabled.
In addition, move setting of IB_WC_WITH_SMAC below
setting of wc->smac.

Signed-off-by: Weihang Li <liweihang@hisilicon.com>
Link: https://lore.kernel.org/r/1565343666-73193-2-git-send-email-oulijun@huawei.com


Signed-off-by: Doug Ledford <dledford@redhat.com>