e100: timer power saving

Since E100 timer is 2HZ, use rounding to make timer occur on the
correct boundary.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/e100.c

@@ -1605,7 +1605,8 @@ static void e100_watchdog(unsigned long data)
 	else
 		nic->flags &= ~ich_10h_workaround;
 
-	mod_timer(&nic->watchdog, jiffies + E100_WATCHDOG_PERIOD);
+	mod_timer(&nic->watchdog,
+		  round_jiffies(jiffies + E100_WATCHDOG_PERIOD));
 }
 
 static void e100_xmit_prepare(struct nic *nic, struct cb *cb,