From 264583fe7d25bf3ac67468cab7fbcf60344778c7 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@warmcat.com>
Date: Tue, 17 Jul 2018 18:29:25 +0800
Subject: [PATCH] lws_get_peer_write_allowance: cope with no role callback for
 it

https://github.com/warmcat/libwebsockets/issues/1339
---
 lib/core/libwebsockets.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/core/libwebsockets.c b/lib/core/libwebsockets.c
index cbfd8bc9e..d614583f9 100644
--- a/lib/core/libwebsockets.c
+++ b/lib/core/libwebsockets.c
@@ -2123,6 +2123,8 @@ lws_partial_buffered(struct lws *wsi)
 LWS_VISIBLE lws_fileofs_t
 lws_get_peer_write_allowance(struct lws *wsi)
 {
+	if (!wsi->role_ops->tx_credit)
+		return -1;
 	return wsi->role_ops->tx_credit(wsi);
 }