mwifiex: use is_broadcast_ether_addr() instead of memcmp()

Using is_broadcast_ether_addr() instead of directly use
memcmp() to determine if the ethernet address is broadcast
address.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: NBing Zhao <bzhao@marvell.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/sta_cmd.c

@@ -551,7 +551,6 @@ mwifiex_cmd_802_11_key_material(struct mwifiex_private *priv,
 	struct host_cmd_tlv_mac_addr *tlv_mac;
 	u16 key_param_len = 0, cmd_size;
 	int ret = 0;
-	const u8 bc_mac[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
 	cmd->command = cpu_to_le16(HostCmd_CMD_802_11_KEY_MATERIAL);
 	key_material->action = cpu_to_le16(cmd_action);
@@ -593,7 +592,7 @@ mwifiex_cmd_802_11_key_material(struct mwifiex_private *priv,
 			/* set 0 when re-key */
 			key_material->key_param_set.key[1] = 0;
 
-		if (0 != memcmp(enc_key->mac_addr, bc_mac, sizeof(bc_mac))) {
+		if (!is_broadcast_ether_addr(enc_key->mac_addr)) {
 			/* WAPI pairwise key: unicast */
 			key_material->key_param_set.key_info |=
 				cpu_to_le16(KEY_UNICAST);