staging: r8188eu: use is_*_ether_addr() in rtw_macaddr_cfg()

Use is_broadcast_ether_addr() and is_zero_ether_addr() in
rtw_macaddr_cfg(). The buffer is properly aligned.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210830121508.6411-5-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_ieee80211.c

@@ -1032,10 +1032,7 @@ void rtw_macaddr_cfg(u8 *mac_addr)
 		memcpy(mac, mac_addr, ETH_ALEN);
 	}
 
-	if (((mac[0] == 0xff) && (mac[1] == 0xff) && (mac[2] == 0xff) &&
-	     (mac[3] == 0xff) && (mac[4] == 0xff) && (mac[5] == 0xff)) ||
-	    ((mac[0] == 0x0) && (mac[1] == 0x0) && (mac[2] == 0x0) &&
-	     (mac[3] == 0x0) && (mac[4] == 0x0) && (mac[5] == 0x0))) {
+	if (is_broadcast_ether_addr(mac) || is_zero_ether_addr(mac)) {
 		mac[0] = 0x00;
 		mac[1] = 0xe0;
 		mac[2] = 0x4c;