!449 消除napi_query_syscap.cpp文件安全告警

Merge pull request !449 from tongkai0808fh/master

napi/napi_query_syscap.cpp

@@ -223,6 +223,7 @@ napi_value QuerySystemCapability(napi_env env, napi_callback_info info)
         },
         (void*)asyncContext, &asyncContext->work);
     napi_queue_async_work(env, asyncContext->work);
+    delete asyncContext;
 
     return result;
 }