normalizing trace comparison mechanism

src/core/roctracer.cpp

@@ -853,6 +853,7 @@ static roctracer_status_t roctracer_enable_activity_fun(
         roctracer::hsa_support::async_copy_callback_enabled = true;
       } else {
         const bool init_phase = (roctracer::RocpLoader::GetRef() == NULL);
+        if (roctracer::RocpLoader::GetRef() == NULL) break;
         if (init_phase == true) {
           roctracer::RocpLoader::Instance().InitActivityCallback((void*)roctracer::HSA_AsyncActivityCallback,
                                                                  (void*)pool);