net: hldc_fr: use dev_addr_set()

Commit 406f42fa ("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.
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/wan/hdlc_fr.c

@@ -1093,7 +1093,9 @@ static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
 		dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 		eth_hw_addr_random(dev);
 	} else {
-		*(__be16 *)dev->dev_addr = htons(dlci);
+		__be16 addr = htons(dlci);
+
+		dev_addr_set(dev, (u8 *)&addr);
 		dlci_to_q922(dev->broadcast, dlci);
 	}
 	dev->netdev_ops = &pvc_ops;