[gtk+/gtk-3-14] inspector: Avoid a NULL deref

[Matthias Clasen <matthiasc src gnome org>]

commit 6ea83871a4ec8e07e2782576278e55c0cc5d9e10
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jul 17 19:56:14 2015 -0400

    inspector: Avoid a NULL deref
    
    Coverity pointed out that getting a class name requires
    dereferencing the pointer, so only don't do it if it is NULL.

 gtk/inspector/widget-tree.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/inspector/widget-tree.c b/gtk/inspector/widget-tree.c
index d67caf5..450ca23 100644
--- a/gtk/inspector/widget-tree.c
+++ b/gtk/inspector/widget-tree.c
@@ -283,7 +283,10 @@ gtk_inspector_widget_tree_append_object (GtkInspectorWidgetTree *wt,
   else
     mapped = TRUE;
 
-  class_name = G_OBJECT_CLASS_NAME (G_OBJECT_GET_CLASS (object));
+  if (G_IS_OBJECT (object))
+    class_name = G_OBJECT_CLASS_NAME (G_OBJECT_GET_CLASS (object));
+  else
+    class_name = "";
 
   if (GTK_IS_WIDGET (object))
     {