rearranged the failure handling code

git-svn-id: svn://anubis/fart/trunk@241 7f9b0f55-74a9-4bce-be96-3c2cd072584d

distrib/distrib.cc

@@ -374,7 +374,9 @@ int distrib::getTask()
             m_next_task++;
         }
         pthread_mutex_unlock(&m_task_mutex);
-        if (task == -1)
+        if (task > -1)
+            startTask(task);
+        else
         {
             pthread_mutex_lock(&m_tasks_in_progress_mutex);
             std::map<int, int>::const_iterator it = m_tasks_in_progress.begin();
@@ -384,8 +386,6 @@ int distrib::getTask()
             }
             pthread_mutex_unlock(&m_tasks_in_progress_mutex);
         }
-        if (task > -1)
-            startTask(task);
     }
     else
     {