Fix CVE-2016-10133:

https://bugs.ghostscript.com/show_bug.cgi?id=697401
http://seclists.org/oss-sec/2017/q1/74
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10133

Patch lifted from upstream source repository:

https://git.ghostscript.com/?p=mujs.git;h=77ab465f1c394bb77f00966cd950650f3f53cb24

From 77ab465f1c394bb77f00966cd950650f3f53cb24 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@gmail.com>
Date: Thu, 12 Jan 2017 14:47:01 +0100
Subject: [PATCH] Fix 697401: Error when dropping extra arguments to
 lightweight functions.

---
 thirdparty/mujs/jsrun.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/thirdparty/mujs/jsrun.c b/thirdparty/mujs/jsrun.c
index ee80845..782a6f9 100644
--- a/thirdparty/mujs/jsrun.c
+++ b/thirdparty/mujs/jsrun.c
@@ -937,7 +937,7 @@ static void jsR_calllwfunction(js_State *J, int n, js_Function *F, js_Environmen
 	jsR_savescope(J, scope);
 
 	if (n > F->numparams) {
-		js_pop(J, F->numparams - n);
+		js_pop(J, n - F->numparams);
 		n = F->numparams;
 	}
 	for (i = n; i < F->varlen; ++i)
-- 
2.9.1

