[gnome-calendar/calendar-management] sources-dialog: cast to GDestroyNotify

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit d3a00eda7e9f633274a3c61c52ca97487682fe35
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Jan 15 06:55:34 2015 -0200

    sources-dialog: cast to GDestroyNotify
    
    Only to avoid some compiler warnings.

 src/gcal-source-manager-dialog.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/gcal-source-manager-dialog.c b/src/gcal-source-manager-dialog.c
index 0023789..7d7b95d 100644
--- a/src/gcal-source-manager-dialog.c
+++ b/src/gcal-source-manager-dialog.c
@@ -298,7 +298,8 @@ gcal_source_manager_dialog_init (GcalSourceManagerDialog *self)
 
   priv = gcal_source_manager_dialog_get_instance_private (self);
 
-  priv->row_to_source = g_hash_table_new_full (g_direct_hash, g_direct_equal, gtk_widget_destroy, NULL);
+  priv->row_to_source = g_hash_table_new_full (g_direct_hash, g_direct_equal, (GDestroyNotify) 
gtk_widget_destroy,
+                                               NULL);
 
   gtk_widget_init_template (GTK_WIDGET (self));
 }