mac->ops.setup_fc can be null for backplanes which can cause the driver
to crash on load.
Reported-by: NPatrick McLean <patrickm@gaikai.com>
Signed-off-by: NEmil Tantilov <emil.s.tantilov@intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>