Fix timer initialization

A newly created timer was always considered as running.

src/refit/scheduler/REFITTimer.java

@@ -12,7 +12,7 @@ public class REFITTimer implements Comparable<REFITTimer> {
 	private final long timerID;
 	private final TimerCallback callback;
 	// must not change as long as the timer is active!!!
-	private long timeout;
+	private long timeout = -1L;
 
 	private boolean hasExpired = false;
 
@@ -21,6 +21,7 @@ public class REFITTimer implements Comparable<REFITTimer> {
 		this.scheduler = scheduler;
 		this.timerID = timerID;
 		this.callback = callback;
+		clear();
 	}
 
 	public long currentTimeout() {