CDRIVER-3522 use correct data structure for IPv6

Author: rcsanchez97

src/libmongoc/src/mongoc/mongoc-stream-tls-openssl.c

@@ -712,12 +712,13 @@ mongoc_stream_tls_openssl_new (mongoc_stream_t *base_stream,
 #if OPENSSL_VERSION_NUMBER >= 0x10002000L && !defined(LIBRESSL_VERSION_NUMBER)
    if (!opt->allow_invalid_hostname) {
       struct in_addr addr;
+      struct in6_addr addr6;
       X509_VERIFY_PARAM *param = X509_VERIFY_PARAM_new ();
 
       X509_VERIFY_PARAM_set_hostflags (param,
                                        X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
       if (inet_pton (AF_INET, host, &addr) ||
-          inet_pton (AF_INET6, host, &addr)) {
+          inet_pton (AF_INET6, host, &addr6)) {
          X509_VERIFY_PARAM_set1_ip_asc (param, host);
       } else {
          X509_VERIFY_PARAM_set1_host (param, host, 0);