refine the hls_on_notify, only read a chunk.

@@ -243,7 +243,7 @@ int SrsDvrAsyncCallOnHlsNotify::call()
         for (int i = 0; i < (int)on_hls->args.size(); i++) {
             std::string url = on_hls->args.at(i);
             if ((ret = SrsHttpHooks::on_hls_notify(url, req, ts_url)) != ERROR_SUCCESS) {
-                srs_error("hook client on_hls_notify failed. url=%s, ret=%d", url.c_str(), ret);
+                srs_error("hook client on_hls_notify failed. url=%s, ts=%s, ret=%d", url.c_str(), ts_url.c_str(), ret);
                 return ret;
             }
         }

@@ -361,10 +361,10 @@ int SrsHttpHooks::on_hls_notify(std::string url, SrsRequest* req, std::string ts
     ISrsHttpResponseReader* br = msg->body_reader();
     while (!br->eof()) {
         std::string data;
-        if ((ret = br->read(data)) != ERROR_SUCCESS) {
+        // for notify, only read some data.
+        ret = br->read(data);
         break;
     }
-    }
     
     srs_trace("http hook on_hls_notify success. client_id=%d, url=%s, code=%d, ret=%d",
         client_id, url.c_str(), msg->status_code(), ret);