OpenSSL HTTP/3 bogus CURLINFO_TLS_SSL_PTR

Summary: `curl_easy_getinfo` `CURLINFO_TLS_SSL_PTR` appears to return invalid `SSL` connection pointer for OpenSSL HTTP/3 connections. Using this `SSL` connection results in a crash, and potential other impacts.

#include <curl/curl.h>
#include <openssl/ssl.h>
#include <stdio.h>

static size_t header_callback(char *buffer, size_t size,
                              size_t nitems, void *userdata)
{
  size_t actual = nitems * size;
  CURL *curl = (CURL *) userdata;
  size_t printactual = actual;

  if …