mac80211: use eth_hw_addr_set()

Commit 406f42fa0d ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it got through appropriate helpers.

Convert mac80211 from memcpy(... ETH_ADDR) to eth_hw_addr_set():

  @@
  expression dev, np;
  @@
  - memcpy(dev->dev_addr, np, ETH_ALEN)
  + eth_hw_addr_set(dev, np)

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20211019162816.1384077-1-kuba@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/iface.c

@@ -1137,9 +1137,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 	 * this interface, if it has the special null one.
 	 */
 	if (dev && is_zero_ether_addr(dev->dev_addr)) {
-		memcpy(dev->dev_addr,
-		       local->hw.wiphy->perm_addr,
-		       ETH_ALEN);
+		eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
 		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 
 		if (!is_valid_ether_addr(dev->dev_addr)) {
@@ -1993,9 +1991,9 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 
 		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
 		if (is_valid_ether_addr(params->macaddr))
-			memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
+			eth_hw_addr_set(ndev, params->macaddr);
 		else
-			memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
+			eth_hw_addr_set(ndev, ndev->perm_addr);
 		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 
 		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */