Rename tls13 prefix to fix coding issues

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index b801499..2160359 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -737,7 +737,7 @@
         unsigned char app      [MBEDTLS_TLS1_3_MD_MAX_SIZE];
     } tls1_3_master_secrets;
 
-    mbedtls_ssl_tls1_3_handshake_secrets tls1_3_hs_secrets;
+    mbedtls_ssl_tls1_3_handshake_secrets tls13_hs_secrets;
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
 
 #if defined(MBEDTLS_SSL_SESSION_TICKETS)