staging: rtl8188eu: use is_multicast_ether_addr in rtl8188eu_xmit.c

Use is_multicast_ether_addr instead of custom IS_MCAST in
hal/rtl8188eu_xmit.c.

There is only one use, so remove the extra variable for the
result of IS_MCAST.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/hal/rtl8188eu_xmit.c

@@ -167,7 +167,6 @@ static s32 update_txdesc(struct xmit_frame *pxmitframe, u8 *pmem, s32 sz, u8 bag
 	struct tx_desc	*ptxdesc = (struct tx_desc *)pmem;
 	struct mlme_ext_priv	*pmlmeext = &adapt->mlmeextpriv;
 	struct mlme_ext_info	*pmlmeinfo = &(pmlmeext->mlmext_info);
-	int	bmcst = IS_MCAST(pattrib->ra);
 
 	if (adapt->registrypriv.mp_mode == 0) {
 		if ((!bagg_pkt) && (urb_zero_packet_chk(adapt, sz) == 0)) {
@@ -186,7 +185,7 @@ static s32 update_txdesc(struct xmit_frame *pxmitframe, u8 *pmem, s32 sz, u8 bag
 
 	ptxdesc->txdw0 |= cpu_to_le32(((offset) << OFFSET_SHT) & 0x00ff0000);/* 32 bytes for TX Desc */
 
-	if (bmcst)
+	if (is_multicast_ether_addr(pattrib->ra))
 		ptxdesc->txdw0 |= cpu_to_le32(BMC);
 
 	if (adapt->registrypriv.mp_mode == 0) {