Add client state number check

It is temporary check. If any change on `mbedtls_ssl_states`, please
double check those tests

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 2eb9a73..aa6c085 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -851,7 +851,7 @@
 {
     int ret = 0;
 
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) );
+    MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls1_3 client state: %d", ssl->state ) );
 
     switch( ssl->state )
     {