davinci_emac: Fix use after free in davinci_emac_remove

free_netdev finally calls kfree which makes the contents
of ndev and priv (private data contained in ndev) invalid.

So iounmap should be called before free_netdev.

Cc: David S. Miller <davem@davemloft.net>
Cc: Chaithrika U S <chaithrika@ti.com>
Cc: Sriramakrishnan <srk@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/davinci_emac.c

@@ -2944,8 +2944,8 @@ static int __devexit davinci_emac_remove(struct platform_device *pdev)
 	release_mem_region(res->start, res->end - res->start + 1);
 
 	unregister_netdev(ndev);
-	free_netdev(ndev);
 	iounmap(priv->remap_addr);
+	free_netdev(ndev);
 
 	clk_disable(emac_clk);
 	clk_put(emac_clk);