[glib] GIOScheduler: Fix access after free in "cancelled" handler

[Matthias Clasen <matthiasc src gnome org>]

commit a0b71839ee27eec27d8b9da24d25c153d6273f42
Author: Stef Walter <stefw gnome org>
Date:   Tue Jul 17 18:34:16 2012 +0200

    GIOScheduler: Fix access after free in "cancelled" handler
    
     * GCancellable can be "cancelled" more than once if
       g_cancellable_reset() is called.
     * Don't assume that because the "cancelled" signal fired
       it won't fire again.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=680111

 gio/gioscheduler.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gio/gioscheduler.c b/gio/gioscheduler.c
index 856e4b9..24c6451 100644
--- a/gio/gioscheduler.c
+++ b/gio/gioscheduler.c
@@ -130,8 +130,8 @@ on_job_canceled (GCancellable    *cancellable,
 {
   GIOSchedulerJob *job = user_data;
 
+  /* This might be called more than once */
   job->io_priority = -1;
-  job->cancellable_id = 0;
 
   if (job_thread_pool != NULL)
     g_thread_pool_set_sort_function (job_thread_pool,