staging: r8188eu: use is_multicast_ether_addr in os_dep/recv_linux.c

Use is_multicast_ether_addr instead of custom macro IS_MCAST, the
buffer is properly aligned.
Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210823120106.9633-9-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/os_dep/recv_linux.c

@@ -132,7 +132,7 @@ int rtw_recv_indicatepkt(struct adapter *padapter,
 		struct sta_info *psta = NULL;
 		struct sta_priv *pstapriv = &padapter->stapriv;
 		struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
-		int bmcast = IS_MCAST(pattrib->dst);
+		bool bmcast = is_multicast_ether_addr(pattrib->dst);
 
 		if (memcmp(pattrib->dst, myid(&padapter->eeprompriv),
 				 ETH_ALEN)) {