[PKT_SCHED]: Bad TDIFF_SAFE in csz.

This code in the csz scheduler, is just plain broken.  The TDIFF_SAFE 
effectively expands to:
	unsigned long delay = now - q->t_c;
	if (delay > 0) {
		delay = 0;
		goto do_reset;
	}
	if (delay >> q->delta_log)

So delay is always 0!  I assume that what was originally intended
is the to keep delay bounded to 1<<q->delta_log. 
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@redhat.com>

net/sched/sch_csz.c

@@ -378,10 +378,8 @@ static unsigned long csz_update(struct Qdisc *sch)
 	unsigned long		R_c;
 
 	PSCHED_GET_TIME(now);
-	delay = PSCHED_TDIFF_SAFE(now, q->t_c, 0, goto do_reset);
-
+	delay = PSCHED_TDIFF(now, q->t_c);
 	if (delay>>q->delta_log) {
-do_reset:
 		/* Delta is too large.
 		   It is possible if MTU/BW > 1<<q->delta_log
 		   (i.e. configuration error) or because of hardware