wifi: ath: Use is_multicast_ether_addr() to check multicast Ether address

Use is_multicast_ether_addr() to perform the Checking.
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230814124212.302738-2-ruanjinjie@huawei.com

drivers/net/wireless/ath/key.c

@@ -104,7 +104,7 @@ bool ath_hw_keysetmac(struct ath_common *common, u16 entry, const u8 *mac)
 		 * Not setting this bit allows the hardware to use the key
 		 * for multicast frame decryption.
 		 */
-		if (mac[0] & 0x01)
+		if (is_multicast_ether_addr(mac))
 			unicast_flag = 0;
 
 		macLo = get_unaligned_le32(mac);