!754 【OpenHarmony开源贡献者计划2022】warning: non-void function does not return a value

Merge pull request !754 from 田卫平/master

test/framework/src/ui_test_app.cpp

@@ -41,6 +41,7 @@ void* AutoTestThread(void*)
     AutoTestApp::GetInstance()->Start();
     AutoTestCaseGroup::TearDownTestCase();
     CompareTools::UnsetLogPath();
+    return nullptr;
 }
 
 UITestApp* UITestApp::GetInstance()