fix timeout not init safety_flag

include/sled/task_queue/pending_task_safety_flag.h

@@ -54,7 +54,7 @@ private:
 inline std::function<void()>
 SafeTask(scoped_refptr<PendingTaskSafetyFlag> flag, std::function<void()> task)
 {
-    return [task, flag]() mutable {
+    return [flag, task]() mutable {
         if (flag->alive()) { std::move(task)(); }
     };
 }

src/timer/task_queue_timeout.cc

@@ -7,7 +7,8 @@ namespace sled {
 TaskQueueTimeoutFactory::TaskQueueTimeout::TaskQueueTimeout(TaskQueueTimeoutFactory &parent,
                                                             sled::TaskQueueBase::DelayPrecision precision)
     : parent_(parent),
-      precision_(precision)
+      precision_(precision),
+      safety_flag_(PendingTaskSafetyFlag::Create())
 {}
 
 TaskQueueTimeoutFactory::TaskQueueTimeout::~TaskQueueTimeout() {}