[gnome-software] trivial: Fix a warning about NULL/FALSE confusion

[Richard Hughes <rhughes src gnome org>]

commit 79f5944ee8b92a2757fcadf57fe377e41451dde8
Author: Richard Hughes <richard hughsie com>
Date:   Thu Feb 18 08:10:44 2016 +0000

    trivial: Fix a warning about NULL/FALSE confusion

 src/plugins/gs-plugin-xdg-app.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/gs-plugin-xdg-app.c b/src/plugins/gs-plugin-xdg-app.c
index 9717f15..972da90 100644
--- a/src/plugins/gs-plugin-xdg-app.c
+++ b/src/plugins/gs-plugin-xdg-app.c
@@ -751,7 +751,7 @@ gs_plugin_refine_item_origin (GsPlugin *plugin,
                     gs_app_get_xdgapp_name (app),
                     gs_app_get_xdgapp_arch (app),
                     gs_app_get_xdgapp_branch (app));
-       return NULL;
+       return FALSE;
 }
 
 /**