[PATCH] shaper: use time_after() macro

From: Marcelo Feitoza Parisi <marcelo@feitoza.com.br>

It deals with wrapping correctly and is nicer to read.

Signed-off-by: Marcelo Feitoza Parisi <marcelo@feitoza.com.br>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

Index: linux-kj/drivers/net/shaper.c
===================================================================
--- linux-kj.orig/drivers/net/shaper.c
+++ linux-kj/drivers/net/shaper.c
@@ -168,7 +168,8 @@ static int shaper_start_xmit(struct sk_b
 		/*
 		 *	Queue over time. Spill packet.
 		 */
-		if(SHAPERCB(skb)->shapeclock-jiffies > SHAPER_LATENCY) {
+		if(time_after(SHAPERCB(skb)->shapeclock, jiffies
+					+ SHAPER_LATENCY)) {
 			dev_kfree_skb(skb);
 			shaper->stats.tx_dropped++;
 		} else