fix name conversion issue for tls13 server entry

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index c43f95e..3604192 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -5189,7 +5189,7 @@
     {
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
         if( mbedtls_ssl_conf_is_tls13_only( ssl->conf ) )
-            ret = mbedtls_ssl_handshake_server_step_tls1_3( ssl );
+            ret = mbedtls_ssl_tls13_handshake_server_step( ssl );
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)