fsl/fman: Remove a useless call to 'dev_set_drvdata()'

Commit c6e26ea8 ("dpaa_eth: change device used") has removed usage of
'dev_set_drvdata()' in the 'mac_probe() function.

This call should also be axed.
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fman/mac.c

@@ -713,7 +713,6 @@ static int mac_probe(struct platform_device *_of_dev)
 		__devm_release_region(dev, fman_get_mem_region(priv->fman),
 				      res.start, res.end + 1 - res.start);
 		devm_kfree(dev, mac_dev);
-		dev_set_drvdata(dev, NULL);
 		return -ENODEV;
 	}