Fix CVE-2016-9136:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9136
http://bugs.ghostscript.com/show_bug.cgi?id=697244

Patch copied from upstream source repository:
http://git.ghostscript.com/?p=mujs.git;a=commitdiff;h=a0ceaf5050faf419401fe1b83acfa950ec8a8a89
From a0ceaf5050faf419401fe1b83acfa950ec8a8a89 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Mon, 31 Oct 2016 13:05:37 +0100
Subject: [PATCH] Fix 697244: Check for incomplete escape sequence at end of
 input.

---
 jslex.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/jslex.c b/jslex.c
index cbd0eeb..aaafdac 100644
--- a/thirdparty/mujs/jslex.c
+++ b/thirdparty/mujs/jslex.c
@@ -377,6 +377,7 @@ static int lexescape(js_State *J)
 		return 0;
 
 	switch (J->lexchar) {
+	case 0: jsY_error(J, "unterminated escape sequence");
 	case 'u':
 		jsY_next(J);
 		if (!jsY_ishex(J->lexchar)) return 1; else { x |= jsY_tohex(J->lexchar) << 12; jsY_next(J); }
-- 
2.10.2

