virt_wifi: fix error return code in virt_wifi_newlink()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: c7cdba31 ("mac80211-next: rtnetlink wifi simulation device")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/virt_wifi.c

@@ -530,8 +530,10 @@ static int virt_wifi_newlink(struct net *src_net, struct net_device *dev,
 	SET_NETDEV_DEV(dev, &priv->lowerdev->dev);
 	dev->ieee80211_ptr = kzalloc(sizeof(*dev->ieee80211_ptr), GFP_KERNEL);
 
-	if (!dev->ieee80211_ptr)
+	if (!dev->ieee80211_ptr) {
+		err = -ENOMEM;
 		goto remove_handler;
+	}
 
 	dev->ieee80211_ptr->iftype = NL80211_IFTYPE_STATION;
 	dev->ieee80211_ptr->wiphy = common_wiphy;