When setting a MAC filter for the VF the function should return a success
or failure code, not the index of the new filter.  It causes spurious NACK
returns to the VF driver.
Signed-off-by: NGreg Rose <gregory.v.rose@intel.com>
Tested-by: NPhil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: NSibai Li <sibai.li@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>