Guards ticket_creation_time

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 6963ce2..23f0ff9 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -1973,7 +1973,7 @@
      * Make sure both session structures are identical
      */
 #if defined(MBEDTLS_HAVE_TIME)
-#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
+#if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SRV_C)
     if (tls_version == MBEDTLS_SSL_VERSION_TLS1_3) {
         TEST_ASSERT(original.ticket_creation_time == restored.ticket_creation_time);
     }