Merge "Check startup_future before using it"

system/hci/src/hci_layer.cc

@@ -342,6 +342,9 @@ static void event_finish_startup(UNUSED_ATTR void* context) {
   std::lock_guard<std::recursive_timed_mutex> lock(
       commands_pending_response_mutex);
   alarm_cancel(startup_timer);
+  if (!startup_future) {
+    return;
+  }
   future_ready(startup_future, FUTURE_SUCCESS);
   startup_future = NULL;
 }
@@ -358,9 +361,11 @@ static void startup_timer_expired(UNUSED_ATTR void* context) {
     // hence abort.
     abort();
   }
+  if (!startup_future) {
+    return;
+  }
   future_ready(startup_future, FUTURE_FAIL);
   startup_future = NULL;
-  lock.unlock();
 }
 
 // Command/packet transmitting functions