staging: wilc1000: return exact error of register_netdev() from wilc_netdev_init()

Refactor wilc_netdev_init() to return the error code received from
register_netdev() during the failure condition.

Earlier discussion link
[1]. https://www.spinics.net/lists/linux-wireless/msg177304.htmlSuggested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/linux_wlan.c

@@ -1062,7 +1062,8 @@ int wilc_netdev_init(struct wilc **wilc, struct device *dev, int io_type,
 	if (!wl)
 		return -ENOMEM;
 
-	if (wilc_wlan_cfg_init(wl))
+	ret = wilc_wlan_cfg_init(wl);
+	if (ret)
 		goto free_wl;
 
 	*wilc = wl;
@@ -1074,8 +1075,10 @@ int wilc_netdev_init(struct wilc **wilc, struct device *dev, int io_type,
 	INIT_LIST_HEAD(&wl->rxq_head.list);
 
 	wl->hif_workqueue = create_singlethread_workqueue("WILC_wq");
-	if (!wl->hif_workqueue)
+	if (!wl->hif_workqueue) {
+		ret = -ENOMEM;
 		goto free_cfg;
+	}
 
 	register_inetaddr_notifier(&g_dev_notifier);
 
@@ -1083,8 +1086,10 @@ int wilc_netdev_init(struct wilc **wilc, struct device *dev, int io_type,
 		struct wireless_dev *wdev;
 
 		ndev = alloc_etherdev(sizeof(struct wilc_vif));
-		if (!ndev)
+		if (!ndev) {
+			ret = -ENOMEM;
 			goto free_ndev;
+		}
 
 		vif = netdev_priv(ndev);
 		memset(vif, 0, sizeof(struct wilc_vif));
@@ -1107,6 +1112,7 @@ int wilc_netdev_init(struct wilc **wilc, struct device *dev, int io_type,
 		wdev = wilc_create_wiphy(ndev, dev);
 		if (!wdev) {
 			netdev_err(ndev, "Can't register WILC Wiphy\n");
+			ret = -ENOMEM;
 			goto free_ndev;
 		}
 
@@ -1148,7 +1154,7 @@ int wilc_netdev_init(struct wilc **wilc, struct device *dev, int io_type,
 	wilc_wlan_cfg_deinit(wl);
 free_wl:
 	kfree(wl);
-	return -ENOMEM;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(wilc_netdev_init);