http_chunks: don't write chunks twice with CURLOPT_HTTP_TRANSFER_DECODING on

      piece = curlx_sotouz((ch->datasize >= length)?length:ch->datasize);

      /* Write the data portion available */

      if(conn->data->set.http_ce_skip || !k->writer_stack) {

        if(!k->ignorebody)

          result = Curl_client_write(conn, CLIENTWRITE_BODY, datap, piece);

      }

      else

      if(!conn->data->set.http_te_skip && !k->ignorebody) {

        if(!conn->data->set.http_ce_skip && k->writer_stack)

          result = Curl_unencode_write(conn, k->writer_stack, datap, piece);

        else

          result = Curl_client_write(conn, CLIENTWRITE_BODY, datap, piece);

        if(result)

          return CHUNKE_WRITE_ERROR;

      }

      *wrote += piece;

      ch->datasize -= piece; /* decrease amount left to expect */