mac80211: call dev_alloc_name before copying name to sdata

This partially reverts 1c5cae815d19ffe02bdfda1260949ef2b1806171, because
the netdev name is copied into sdata->name, which is used for debugging
messages, for example. Otherwise, we get messages like this:

wlan%d: authenticated

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Cc: Jiri Pirko <jpirko@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "John W. Linville" <linville@tuxdriver.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/iface.c

@@ -1145,6 +1145,10 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 				+ IEEE80211_ENCRYPT_HEADROOM;
 	ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 
+	ret = dev_alloc_name(ndev, ndev->name);
+	if (ret < 0)
+		goto fail;
+
 	ieee80211_assign_perm_addr(local, ndev, type);
 	memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
 	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));