Fix : apply Julek pr notes

src/ssl.c

@@ -12202,7 +12202,7 @@ const char* wolfSSL_alert_desc_string(int alertID)
         case missing_extension:
             return "ME";
         case unsupported_extension:
-            return "XE";
+            return "UE";
         case unrecognized_name:
             return "UN";
         case bad_certificate_status_response:

wolfcrypt/src/evp.c

@@ -4984,7 +4984,7 @@ int wolfSSL_EVP_DigestSign(WOLFSSL_EVP_MD_CTX *ctx, unsigned char *sigret,
         return WOLFSSL_FAILURE;
 
     if (sigret != NULL) {
-        if (tbs == NULL || tbslen == 0)
+        if (tbs == NULL)
             return WOLFSSL_FAILURE;
         if (wolfSSL_EVP_DigestSignUpdate(ctx, tbs, (unsigned int)tbslen)
                 != WOLFSSL_SUCCESS)