[gnome-photos/wip/facebook] properties-dialog: Fix a compiler warning

[Álvaro Peña <alvaropg src gnome org>]

commit f60f29cdce53fcff68ee1c6a7617541bcedd70c9
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Aug 20 09:52:11 2013 +0200

    properties-dialog: Fix a compiler warning

 src/photos-properties-dialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/photos-properties-dialog.c b/src/photos-properties-dialog.c
index 82d07df..adaae7a 100644
--- a/src/photos-properties-dialog.c
+++ b/src/photos-properties-dialog.c
@@ -159,7 +159,7 @@ photos_properties_dialog_constructed (GObject *object)
   GtkWidget *source;
   GtkWidget *source_data;
   GtkWidget *title;
-  GtkWidget *width_w;
+  GtkWidget *width_w = NULL;
   GQuark equipment;
   GQuark flash;
   PhotosBaseItem *item;