[libgda] Return FALSE instead of NULL

[Vivien Malerba <vivien src gnome org>]

commit 6b4080fe9c470c0914a6b25418f8aeaad54f773c
Author: Arthur Neves <arthurnn gmail com>
Date:   Wed Feb 10 08:10:21 2016 -0500

    Return FALSE instead of NULL
    
    The function expects a gboolean

 tools/browser/ui-customize.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tools/browser/ui-customize.c b/tools/browser/ui-customize.c
index 514ee83..70d4ee3 100644
--- a/tools/browser/ui-customize.c
+++ b/tools/browser/ui-customize.c
@@ -131,7 +131,7 @@ customization_data_init (GObject *object, GtkToolbar *toolbar, GtkHeaderBar *hea
 gboolean
 customization_data_exists (GObject *object)
 {
-       g_return_val_if_fail (G_IS_OBJECT (object), NULL);
+       g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
        return customization_data_get (object) ? TRUE : FALSE;
 }