sfc: don't fail probe if MAE/TC setup fails

Existing comment in the source explains why we don't want efx_init_tc()
failure to be fatal. Cited commit erroneously consolidated failure
paths causing the probe to be failed in this case.

Fixes: 7e056e2360d9 ("sfc: obtain device mac address based on firmware handle for ef100")
Reviewed-by: Martin Habets <[e-mail]>
Signed-off-by: Edward Cree <[e-mail]>
Link: https://lore.kernel.org/r/aa7f[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/sfc/ef100_nic.c

···
 		net_dev->features |= NETIF_F_HW_TC;
 		efx->fixed_features |= NETIF_F_HW_TC;
 	}
-	return rc;
+	return 0;
 }
 
 int ef100_probe_vf(struct efx_nic *efx)