message: fixed http2_client memory leak.
diff: @@ -1042,6 +1042,11 @@ static PHP_METHOD(swoole_http2_client, __destruct)
  nghttp2_hd_inflate_del(hcc->inflater);
  hcc->inflater = NULL;
  }
  + if (hcc->host)
  + {
  + efree(hcc->host);
  + hcc->host = NULL;
  + }
  swHashMap_free(hcc->streams);
  efree(hcc);
  