Enable ssl_tls13_get_ciphersuite_hash_alg only if macro is active

Signed-off-by: Norbert Fabritius <norbert.fabritius@esrlabs.com>
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 7fcc394..162e3a3 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -666,6 +666,7 @@
     return 0;
 }
 
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
 static psa_algorithm_t ssl_tls13_get_ciphersuite_hash_alg(int ciphersuite)
 {
     const mbedtls_ssl_ciphersuite_t *ciphersuite_info = NULL;
@@ -678,7 +679,6 @@
     return PSA_ALG_NONE;
 }
 
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
 static int ssl_tls13_has_configured_ticket(mbedtls_ssl_context *ssl)
 {
     mbedtls_ssl_session *session = ssl->session_negotiate;