Use of the time_after_eq() macro, defined at linux/jiffies.h, which deal
with wrapping correctly and are nicer to read.

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

--- linux/drivers/net/ppp_async.c	2005-07-13 17:52:19.000000000 -0300
+++ linux-kj/drivers/net/ppp_async.c	2005-07-16 01:15:56.774000552 -0300
@@ -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 @@
 		 * 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;