Revert "total_queued should always be >= total_staged"

This reverts commit 5a861bf1e4.

No good.

main.c

@@ -1191,7 +1191,7 @@ static void inc_queued(void)
 static void dec_queued(void)
 {
 	pthread_mutex_lock(&qd_lock);
-	if (total_queued > total_staged)
+	if (total_queued > 0)
 		total_queued--;
 	pthread_mutex_unlock(&qd_lock);
 	dec_staged(1);