[NET_SCHED]: turn PSCHED_TDIFF_SAFE into inline function

Also rename to psched_tdiff_bounded.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 0a5679e..65d60a3 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -298,8 +298,8 @@
 
 		PSCHED_GET_TIME(now);
 
-		toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
-					 police->tcfp_burst);
+		toks = psched_tdiff_bounded(now, police->tcfp_t_c,
+					    police->tcfp_burst);
 		if (police->tcfp_P_tab) {
 			ptoks = toks + police->tcfp_ptoks;
 			if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
@@ -544,8 +544,8 @@
 		}
 
 		PSCHED_GET_TIME(now);
-		toks = PSCHED_TDIFF_SAFE(now, police->tcfp_t_c,
-					 police->tcfp_burst);
+		toks = psched_tdiff_bounded(now, police->tcfp_t_c,
+					    police->tcfp_burst);
 		if (police->tcfp_P_tab) {
 			ptoks = toks + police->tcfp_ptoks;
 			if (ptoks > (long)L2T_P(police, police->tcfp_mtu))
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index b7abd0a..71e4c92 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -729,7 +729,7 @@
 	cl->T = toks
 
 	while (cl) {
-		diff = PSCHED_TDIFF_SAFE(q->now, cl->t_c, (u32) cl->mbuffer);
+		diff = psched_tdiff_bounded(q->now, cl->t_c, cl->mbuffer);
 		if (cl->level >= level) {
 			if (cl->level == level)
 				cl->xstats.lends++;
@@ -789,7 +789,7 @@
 			return cl->pq_key;
 
 		htb_safe_rb_erase(p, q->wait_pq + level);
-		diff = PSCHED_TDIFF_SAFE(q->now, cl->t_c, (u32) cl->mbuffer);
+		diff = psched_tdiff_bounded(q->now, cl->t_c, cl->mbuffer);
 		htb_change_class_mode(q, cl, &diff);
 		if (cl->cmode != HTB_CAN_SEND)
 			htb_add_to_wait_tree(q, cl, diff);
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 626ce96..da9f40e 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -201,7 +201,7 @@
 
 		PSCHED_GET_TIME(now);
 
-		toks = PSCHED_TDIFF_SAFE(now, q->t_c, q->buffer);
+		toks = psched_tdiff_bounded(now, q->t_c, q->buffer);
 
 		if (q->P_tab) {
 			ptoks = toks + q->ptokens;