esp-tls: Fix HTTP2 failure

Closes https://github.com/espressif/esp-idf/issues/1874

examples/protocols/http2_request/components/sh2lib/sh2lib.h

@@ -34,7 +34,6 @@
  */
 struct sh2lib_handle {
     nghttp2_session *http2_sess;   /*!< Pointer to the HTTP2 session handle */
-    int              sockfd;       /*!< Socket file descriptor */
     char            *hostname;     /*!< The hostname we are connected to */
     struct esp_tls  *http2_tls;    /*!< Pointer to the TLS session handle */
 };