Add MBEDTLS_SSL_SESSION_TICKETS guard to server name check

Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 0efc8e7..4cf6704 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1182,6 +1182,7 @@
 #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS)
+    uint8_t MBEDTLS_PRIVATE(endpoint);          /*!< 0: client, 1: server */
     uint8_t MBEDTLS_PRIVATE(ticket_flags);      /*!< Ticket flags */
     uint32_t MBEDTLS_PRIVATE(ticket_age_add);               /*!< Randomly generated value used to obscure the age of the ticket */
     uint8_t MBEDTLS_PRIVATE(resumption_key_len);            /*!< resumption_key length */
@@ -1200,10 +1201,10 @@
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
     mbedtls_ssl_tls13_application_secrets MBEDTLS_PRIVATE(app_secrets);
 
-    uint8_t MBEDTLS_PRIVATE(endpoint);          /*!< 0: client, 1: server */
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) && \
+    defined(MBEDTLS_SSL_SESSION_TICKETS)
     char *MBEDTLS_PRIVATE(hostname);             /*!< host name binded with tickets */
-#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
+#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION && MBEDTLS_SSL_SESSION_TICKETS */
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
 };