[gjs] gjs_parse_args() wrong check with format 'u'

[Jasper St. Pierre <jstpierre src gnome org>]

commit 4fba3073e1d9376debcae1c79ddd6988a9f47131
Author: Sebastien Lafargue <slaf66 gmail com>
Date:   Wed Sep 18 00:03:45 2013 +0200

    gjs_parse_args() wrong check with format 'u'
    
    Only positive integers must pass the check but actually, strings can pass
    ( even with no digit in, with a result  of 0 )
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707297

 gjs/jsapi-util.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gjs/jsapi-util.c b/gjs/jsapi-util.c
index 15b42ac..203621a 100644
--- a/gjs/jsapi-util.c
+++ b/gjs/jsapi-util.c
@@ -996,7 +996,7 @@ gjs_parse_args (JSContext  *context,
             break;
         case 'u': {
             gdouble num;
-            if (!JS_ValueToNumber(context, js_value, &num)) {
+            if (!JSVAL_IS_NUMBER(js_value) || !JS_ValueToNumber(context, js_value, &num)) {
                 /* Our error message is going to be more useful */
                 JS_ClearPendingException(context);
                 arg_error_message = "Couldn't convert to unsigned integer";