gianfar: Fix build.

Reported by Michael Guntsche <mike@it-loops.com>

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Commit
38bddf04 gianfar: gfar_remove needs to call unregister_netdev()

breaks the build of the gianfar driver because "dev" is undefined in
this function. To quickly test rc9 I changed this to priv->ndev but I do
not know if this is the correct one.
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Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/gianfar.c

@@ -491,7 +491,7 @@ static int gfar_remove(struct of_device *ofdev)
 
 	dev_set_drvdata(&ofdev->dev, NULL);
 
-	unregister_netdev(dev);
+	unregister_netdev(priv->ndev);
 	iounmap(priv->regs);
 	free_netdev(priv->ndev);