sfc: avoid duplicate error handling code in 'efx_ef10_sriov_set_vf_mac()'

'eth_zero_addr()' is already called in the error handling path. This is
harmless, but there is no point in calling it twice, so remove one.
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef10_sriov.c

@@ -522,10 +522,9 @@ int efx_ef10_sriov_set_vf_mac(struct efx_nic *efx, int vf_i, u8 *mac)
 
 	if (!is_zero_ether_addr(mac)) {
 		rc = efx_ef10_vport_add_mac(efx, vf->vport_id, mac);
-		if (rc) {
-			eth_zero_addr(vf->mac);
+		if (rc)
 			goto fail;
-		}
+
 		if (vf->efx)
 			ether_addr_copy(vf->efx->net_dev->dev_addr, mac);
 	}