staging: ks7010: fix error paths in ks7010_sdio_remove function

This commit reviews and fixes error paths in ks7010_sdio_remove
driver function. It change logic to handle error directly
after priv dereference to avoid one level indentation. It also
removes a temporal netdev variable which wasn't being used in all
of the function calls. Also if send_stop_request call fails it
was making a direct 'return' instead of doing a properly cleaning.
Because of this a new 'err_free_card' label has been added.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ks7010/ks7010_sdio.c

@@ -1112,10 +1112,10 @@ static void ks7010_sdio_remove(struct sdio_func *func)
 		return;
 
 	priv = card->priv;
-	if (priv) {
-		struct net_device *netdev = priv->net_dev;
+	if (!priv)
+		goto err_free_card;
 
-		ks_wlan_net_stop(netdev);
+	ks_wlan_net_stop(priv->net_dev);
 
 	/* interrupt disable */
 	sdio_claim_host(func);
@@ -1125,7 +1125,7 @@ static void ks7010_sdio_remove(struct sdio_func *func)
 
 	ret = send_stop_request(func);
 	if (ret)	/* memory allocation failure */
-			return;
+		goto err_free_card;
 
 	if (priv->wq) {
 		flush_workqueue(priv->wq);
@@ -1134,17 +1134,17 @@ static void ks7010_sdio_remove(struct sdio_func *func)
 
 	hostif_exit(priv);
 
-		unregister_netdev(netdev);
+	unregister_netdev(priv->net_dev);
 
 	trx_device_exit(priv);
 	free_netdev(priv->net_dev);
 	card->priv = NULL;
-	}
 
 	sdio_claim_host(func);
 	sdio_release_irq(func);
 	sdio_disable_func(func);
 	sdio_release_host(func);
+err_free_card:
 	sdio_set_drvdata(func, NULL);
 	kfree(card);
 }