fixes kernel oops when reset button was pressed too often on atheros

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12245 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/atheros/files/arch/mips/atheros/reset.c

@@ -129,10 +129,8 @@ static irqreturn_t button_handler(int irq, void *dev_id)
 
 	seen = jiffies;
 	if(event->set && no_release_workaround)
-	{
-		rst_button_timer.expires = jiffies + (HZ / 4);
-		add_timer(&rst_button_timer);
-	}
+		mod_timer(&rst_button_timer, jiffies + (HZ / 4));
+
 	return IRQ_HANDLED;
 }