[gnome-builder] highlighting: use dzl_clear_source

[Christian Hergert <chergert src gnome org>]

commit 17c9ca0ba10d556d814664faf245e9701106b8b4
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jan 3 19:39:18 2018 -0800

    highlighting: use dzl_clear_source

 src/libide/highlighting/ide-highlight-engine.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/src/libide/highlighting/ide-highlight-engine.c b/src/libide/highlighting/ide-highlight-engine.c
index f465747..9a70b63 100644
--- a/src/libide/highlighting/ide-highlight-engine.c
+++ b/src/libide/highlighting/ide-highlight-engine.c
@@ -687,11 +687,7 @@ ide_highlight_engine__unbind_buffer_cb (IdeHighlightEngine  *self,
 
   text_buffer = GTK_TEXT_BUFFER (self->buffer);
 
-  if (self->work_timeout)
-    {
-      g_source_remove (self->work_timeout);
-      self->work_timeout = 0;
-    }
+  dzl_clear_source (&self->work_timeout);
 
   g_object_set_qdata (G_OBJECT (text_buffer), engineQuark, NULL);