Fix the max psk len for TLSv1.3
If using an old style TLSv1.2 PSK callback then the maximum possible PSK
len is PSK_MAX_PSK_LEN (256) - not 64.
Fixes
@@ -471,7 +471,7 @@ struct ssl_method_st {
long (*ssl_ctx_callback_ctrl) (SSL_CTX *s, int cb_id, void (*fp) (void));
};
-# define TLS13_MAX_RESUMPTION_PSK_LENGTH 64
+# define TLS13_MAX_RESUMPTION_PSK_LENGTH PSK_MAX_PSK_LEN
/*-
* Lets make this into an ASN.1 type structure as follows
