net: sched: Remove unused qdisc_l2t()

This is unused since switch to psched_l2t_ns().
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230615124810.34020-1-yuehaibing@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/sch_generic.h

@@ -1190,20 +1190,6 @@ static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
 	return NET_XMIT_DROP;
 }
 
-/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
-   long it will take to send a packet given its size.
- */
-static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
-{
-	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
-	if (slot < 0)
-		slot = 0;
-	slot >>= rtab->rate.cell_log;
-	if (slot > 255)
-		return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
-	return rtab->data[slot];
-}
-
 struct psched_ratecfg {
 	u64	rate_bytes_ps; /* bytes per second */
 	u32	mult;