message: Fix http2 mem error.
diff: @@ -452,6 +452,7 @@ static ssize_t http2_client_build_header(zval *zobject, zval *req, char *buffer)
  zval *zheaders = sw_zend_read_property(swoole_http2_request_ce_ptr, req, ZEND_STRL("headers"), 0);
  zval *zcookies = sw_zend_read_property(swoole_http2_request_ce_ptr, req, ZEND_STRL("cookies"), 0);
  nghttp2_nv *nv = (nghttp2_nv *) ecalloc(sizeof(nghttp2_nv), 8 + (ZVAL_IS_ARRAY(zheaders) ? php_swoole_array_length(zheaders) : 0));
  + std::vector<zend::string_ptr> zstr_list;
  http2_client_property *hcc = (http2_client_property *) swoole_get_property(zobject, HTTP2_CLIENT_CORO_PROPERTY);
  if (Z_TYPE_P(zmethod) != IS_STRING || Z_STRLEN_P(zmethod) == 0)
  @@ -488,7 +489,6 @@ static ssize_t http2_client_build_header(zval *zobject, zval *req, char *buffer)
  char *key = NULL;
  uint32_t keylen = 0;
  int type;
  - std::vector<zend::string_ptr> zstr_list;
  SW_HASHTABLE_FOREACH_START2(ht, key, keylen, type, value)
  {
  @@ -522,7 +522,7 @@ static ssize_t http2_client_build_header(zval *zobject, zval *req, char *buffer)
  http2_client_add_cookie(nv, &index, zcookies);
  }
  - ssize_t rv = SW_ERR;;
  + ssize_t rv = SW_ERR;
  size_t buflen = nghttp2_hd_deflate_bound(hcc->deflater, nv, index);
  if (buflen > hcc->remote_settings.max_header_list_size)
  {
  