Fix CVE-2016-7564:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7564
http://bugs.ghostscript.com/show_bug.cgi?id=697137

Patch copied from upstream source repository:
http://git.ghostscript.com/?p=mujs.git;a=commitdiff;h=a3a4fe840b80706c706e86160352af5936f292d8

From a3a4fe840b80706c706e86160352af5936f292d8 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Tue, 20 Sep 2016 17:19:06 +0200
Subject: [PATCH] Fix bug 697137: off by one in string length calculation.

We were not allocating space for the terminating zero byte.
---
 jsfunction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jsfunction.c b/jsfunction.c
index 8b5b18e..28f7aa7 100644
--- a/thirdparty/mujs/jsfunction.c
+++ b/thirdparty/mujs/jsfunction.c
@@ -61,7 +61,7 @@ static void Fp_toString(js_State *J)
 		n += strlen(F->name);
 		for (i = 0; i < F->numparams; ++i)
 			n += strlen(F->vartab[i]) + 1;
-		s = js_malloc(J, n);
+		s = js_malloc(J, n + 1);
 		strcpy(s, "function ");
 		strcat(s, F->name);
 		strcat(s, "(");
-- 
2.10.2

