esp_http_client.c: Clear raw_len for response buffer after dispatching HTTP_EVENT_ON_FINISH event

Closes: https://github.com/espressif/esp-idf/issues/6146

components/esp_http_client/esp_http_client.c

@@ -1027,6 +1027,7 @@ esp_err_t esp_http_client_perform(esp_http_client_handle_t client)
                 }
                 http_dispatch_event(client, HTTP_EVENT_ON_FINISH, NULL, 0);
 
+                client->response->buffer->raw_len = 0;
                 if (!http_should_keep_alive(client->parser)) {
                     ESP_LOGD(TAG, "Close connection");
                     esp_http_client_close(client);