just in case someone continues in the debugger

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13449 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/app/Looper.cpp

@@ -456,6 +456,7 @@ BLooper::Run()
 	if (fRunCalled) {
 		// Not allowed to call Run() more than once
 		debugger("can't call BLooper::Run twice!");
+		return fTaskID;
 	}
 
 	fTaskID = spawn_thread(_task0_, Name(), fInitPriority, this);