fix undeclared variable error
# Conflicts:
#	library/ssl_tls13_client.c
@@ -120,9 +120,7 @@ static int ssl_tls13_write_exts_client_hello( mbedtls_ssl_context *ssl,
* extension list must be kept to write
* the total extension list size in the end.
*/
-#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
int ret;
-#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
unsigned char* extension_start;
size_t cur_ext_len; /* Size of the current extension */
size_t total_ext_len; /* Size of list of extensions */
