roots: if queue is full run again

The task queue may already be full of tasks when the crawl task is
executed.  In this case simply reschedule the crawl task at the
end of the current queue.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

src/bees-roots.cc

@@ -380,13 +380,10 @@ BeesRoots::crawl_thread()
 	m_crawl_task = Task("crawl_master", [shared_this]() {
 		auto tqs = TaskMaster::get_queue_count();
 		BEESNOTE("queueing extents to scan, " << tqs << " of " << BEES_MAX_QUEUE_SIZE);
-		bool run_again = false;
-		while (tqs < BEES_MAX_QUEUE_SIZE) {
+		bool run_again = true;
+		while (tqs < BEES_MAX_QUEUE_SIZE && run_again) {
 			run_again = shared_this->crawl_roots();
 			tqs = TaskMaster::get_queue_count();
-			if (!run_again) {
-				break;
-			}
 		}
 		if (run_again) {
 			shared_this->m_crawl_task.run();