Reorganization of struct NetClientOptions (commit e4ba22b3) caused a
compilation failure of the netmap backend. This patch fixes the issue
by properly accessing the union field.
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NVincenzo Maffione <v.maffione@gmail.com>
Signed-off-by: NJason Wang <jasowang@redhat.com>