benet: fix build error on 32bit arch

Error comes from commit ac124ff973e27802797
(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>
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 1a3acca..7c98d8e 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -936,7 +936,7 @@
 		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;