Only iterate over waitingForSend if necessary

src/refit/communication/REFITConnection.java

@@ -203,12 +203,14 @@ public class REFITConnection {
 	}
 
 	private void sendWakeups() {
-		synchronized (waitingForSend) {
-			for (REFITEventReceiver<? super REFITConnectionWriteableNotification> stage : waitingForSend) {
-				stage.tell(new REFITConnectionWriteableNotification(id));
+		if (hasWaitingForSend) {
+			synchronized (waitingForSend) {
+				for (REFITEventReceiver<? super REFITConnectionWriteableNotification> stage : waitingForSend) {
+					stage.tell(new REFITConnectionWriteableNotification(id));
+				}
+				waitingForSend.clear();
+				hasWaitingForSend = false;
 			}
-			waitingForSend.clear();
-			hasWaitingForSend = false;
 		}
 	}