[PATCH] ppp_async.c: use time_after_eq() 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/ppp_async.c
===================================================================
--- linux-kj.orig/drivers/net/ppp_async.c	2005-10-01 02:49:22.000000000 +0400
+++ linux-kj/drivers/net/ppp_async.c	2005-10-01 02:59:47.000000000 +0400
@@ -30,6 +30,7 @@
 #include <linux/ppp_channel.h>
 #include <linux/spinlock.h>
 #include <linux/init.h>
+#include <linux/jiffies.h>
 #include <asm/uaccess.h>
 
 #define PPP_VERSION	"2.4.2"
@@ -576,7 +577,7 @@ ppp_async_encode(struct asyncppp *ap)
 		 * character if necessary.
 		 */
 		if (islcp || flag_time == 0
-		    || jiffies - ap->last_xmit >= flag_time)
+		    || time_after_eq(jiffies, ap->last_xmit + flag_time))
 			*buf++ = PPP_FLAG;
 		ap->last_xmit = jiffies;
 		fcs = PPP_INITFCS;