brcmfmac: prepare for const netdev->dev_addr

netdev->dev_addr will become const soon. Make sure local
variables maintain that qualifier.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211018235021.1279697-8-kuba@kernel.org

drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c

@@ -2125,7 +2125,7 @@ static int brcmf_p2p_disable_p2p_if(struct brcmf_cfg80211_vif *vif)
 	struct brcmf_cfg80211_info *cfg = wdev_to_cfg(&vif->wdev);
 	struct net_device *pri_ndev = cfg_to_ndev(cfg);
 	struct brcmf_if *ifp = netdev_priv(pri_ndev);
-	u8 *addr = vif->wdev.netdev->dev_addr;
+	const u8 *addr = vif->wdev.netdev->dev_addr;
 
 	return brcmf_fil_iovar_data_set(ifp, "p2p_ifdis", addr, ETH_ALEN);
 }
@@ -2135,7 +2135,7 @@ static int brcmf_p2p_release_p2p_if(struct brcmf_cfg80211_vif *vif)
 	struct brcmf_cfg80211_info *cfg = wdev_to_cfg(&vif->wdev);
 	struct net_device *pri_ndev = cfg_to_ndev(cfg);
 	struct brcmf_if *ifp = netdev_priv(pri_ndev);
-	u8 *addr = vif->wdev.netdev->dev_addr;
+	const u8 *addr = vif->wdev.netdev->dev_addr;
 
 	return brcmf_fil_iovar_data_set(ifp, "p2p_ifdel", addr, ETH_ALEN);
 }