remove curl error buffer

it was useless anyways

src/http.hpp

@@ -131,7 +131,6 @@ private:
     std::string m_url;
     const char *m_method;
     curl_slist *m_header_list = nullptr;
-    std::array<char, CURL_ERROR_SIZE> m_error_buf = { 0 };
     curl_mime *m_form = nullptr;
     std::function<void(curl_off_t, curl_off_t)> m_progress_callback;