staging: rtl8188eu: use is_multicast_ether_addr in rtw_security.c

Use is_multicast_ether_addr instead of custom IS_MCAST in
core/rtw_security.c. In all uses the address array is properly
aligned.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_security.c

@@ -608,7 +608,7 @@ u32	rtw_tkip_encrypt(struct adapter *padapter, u8 *pxmitframe)
 		if (stainfo != NULL) {
 			RT_TRACE(_module_rtl871x_security_c_, _drv_err_, ("%s: stainfo!= NULL!!!\n", __func__));
 
-			if (IS_MCAST(pattrib->ra))
+			if (is_multicast_ether_addr(pattrib->ra))
 				prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
 			else
 				prwskey = &stainfo->dot118021x_UncstKey.skey[0];
@@ -678,7 +678,7 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe)
 	if (prxattrib->encrypt == _TKIP_) {
 		stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
 		if (stainfo) {
-			if (IS_MCAST(prxattrib->ra)) {
+			if (is_multicast_ether_addr(prxattrib->ra)) {
 				if (!psecuritypriv->binstallGrpkey) {
 					res = _FAIL;
 					DBG_88E("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
@@ -1250,7 +1250,7 @@ u32	rtw_aes_encrypt(struct adapter *padapter, u8 *pxmitframe)
 		if (stainfo) {
 			RT_TRACE(_module_rtl871x_security_c_, _drv_err_, ("%s: stainfo!= NULL!!!\n", __func__));
 
-			if (IS_MCAST(pattrib->ra))
+			if (is_multicast_ether_addr(pattrib->ra))
 				prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
 			else
 				prwskey = &stainfo->dot118021x_UncstKey.skey[0];
@@ -1296,7 +1296,7 @@ u32 rtw_aes_decrypt(struct adapter *padapter, u8 *precvframe)
 			struct security_priv *psecuritypriv = &padapter->securitypriv;
 			char iv[8], icv[8];
 
-			if (IS_MCAST(prxattrib->ra)) {
+			if (is_multicast_ether_addr(prxattrib->ra)) {
 				/* in concurrent we should use sw descrypt in group key, so we remove this message */
 				if (!psecuritypriv->binstallGrpkey) {
 					res = _FAIL;