wifi: rtlwifi: use eth_broadcast_addr() to assign broadcast address

Use eth_broadcast_addr() to assign broadcast address instead
of memcpy().
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230804090120.1332091-1-yangyingliang@huawei.com

drivers/net/wireless/realtek/rtlwifi/core.c

@@ -1656,7 +1656,7 @@ static int rtl_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 			memcpy(rtlpriv->sec.key_buf[key_idx],
 			       key->key, key->keylen);
 			rtlpriv->sec.key_len[key_idx] = key->keylen;
-			memcpy(mac_addr, bcast_addr, ETH_ALEN);
+			eth_broadcast_addr(mac_addr);
 		} else {	/* pairwise key */
 			rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
 				"set pairwise key\n");