From 0c78de0d6df13269458d38199f0a8bbe7ce733f2 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 8 Oct 2015 12:53:49 -0300
Subject: [PATCH] avoid calling write function with empty block

---
 ldump.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ldump.c b/ldump.c
index b3d201e9..19030edc 100644
--- a/ldump.c
+++ b/ldump.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldump.c,v 2.35 2015/01/16 16:54:37 roberto Exp roberto $
+** $Id: ldump.c,v 2.36 2015/03/30 15:43:51 roberto Exp roberto $
 ** save precompiled Lua chunks
 ** See Copyright Notice in lua.h
 */
@@ -38,7 +38,7 @@ typedef struct {
 
 
 static void DumpBlock (const void *b, size_t size, DumpState *D) {
-  if (D->status == 0) {
+  if (D->status == 0 && size > 0) {
     lua_unlock(D->L);
     D->status = (*D->writer)(D->L, b, size, D->data);
     lua_lock(D->L);