netem: fix build error on 32bit arches

ERROR: "__udivdi3" [net/sched/sch_netem.ko] undefined!
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Acked-by: NHagen Paul Pfeifer <hagen@jauu.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/sched/sch_netem.c

@@ -301,7 +301,10 @@ static psched_tdiff_t tabledist(psched_tdiff_t mu, psched_tdiff_t sigma,
 
 static psched_time_t packet_len_2_sched_time(unsigned int len, u32 rate)
 {
-	return PSCHED_NS2TICKS((u64)len * NSEC_PER_SEC / rate);
+	u64 ticks = (u64)len * NSEC_PER_SEC;
+
+	do_div(ticks, rate);
+	return PSCHED_NS2TICKS(ticks);
 }
 
 /*