spider_net: Use DECLARE_BITMAP

Use the generic mechanism to declare a bitmap instead of unsigned long.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/toshiba/spider_net.c

@@ -604,8 +604,7 @@ spider_net_set_multi(struct net_device *netdev)
 	int i;
 	u32 reg;
 	struct spider_net_card *card = netdev_priv(netdev);
-	unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] =
-		{0, };
+	DECLARE_BITMAP(bitmask, SPIDER_NET_MULTICAST_HASHES) = {};
 
 	spider_net_set_promisc(card);