benet: fix build error on 32bit arch

Error comes from commit ac124ff
(be2net: cleanup and refactor stats code)

ERROR: "__udivdi3" [drivers/net/benet/be2net.ko] undefined!

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Eric Dumazet

drivers/net/ethernet/emulex/benet/be_main.c

@@ -936,7 +936,7 @@ static void be_rx_eqd_update(struct be_adapter *adapter, struct be_rx_obj *rxo)
 		pkts = stats->rx_pkts;
 	} while (u64_stats_fetch_retry_bh(&stats->sync, start));
 
-	stats->rx_pps = (pkts - stats->rx_pkts_prev) / (delta / HZ);
+	stats->rx_pps = (unsigned long)(pkts - stats->rx_pkts_prev) / (delta / HZ);
 	stats->rx_pkts_prev = pkts;
 	stats->rx_jiffies = now;
 	eqd = stats->rx_pps / 110000;