Cache the reuse of the nonce2 hex length

src/stratifier.c

@@ -1813,8 +1813,9 @@ static json_t *parse_submit(stratum_instance_t *client, json_t *json_msg,
 	strcpy(idstring, wb->idstring);
 	ASPRINTF(&fname, "%s.sharelog", wb->logdir);
 	/* Fix broken clients sending too many chars */
-	if ((int)strlen(nonce2) > wb->enonce2varlen * 2)
+	len = wb->enonce2varlen * 2;
-		nonce2[wb->enonce2varlen * 2] = '\0';
+	if ((int)strlen(nonce2) > len)
+		nonce2[len] = '\0';
 	sdiff = submission_diff(client, wb, nonce2, ntime32, nonce, hash);
 	bswap_256(sharehash, hash);
 	__bin2hex(hexhash, sharehash, 32);
@@ -1824,7 +1825,7 @@ static json_t *parse_submit(stratum_instance_t *client, json_t *json_msg,
 		json_set_string(json_msg, "reject-reason", SHARE_ERR(err));
 		goto out_unlock;
 	}
-	if ((int)strlen(nonce2) < wb->enonce2varlen * 2) {
+	if ((int)strlen(nonce2) < len) {
 		err = SE_INVALID_NONCE2;
 		*err_val = JSON_ERR(err);
 		goto out_unlock;