gtkapplication: Fix passing NULL as the window to inhibit

gtk_application_inhibit() supports passing NULL, so don't
blindly pass the NULL window to
gtk_application_impl_dbus_get_window_system_id().

https://bugzilla.gnome.org/show_bug.cgi?id=728023

diff --git a/gtk/gtkapplication-dbus.c b/gtk/gtkapplication-dbus.c
index cd145d20069fe8e6d964d009f9b25cc0b9a9589b..b0dab7096502c673a56ca60fed7ab1891e8bc916 100644 (file)
--- a/gtk/gtkapplication-dbus.c
+++ b/gtk/gtkapplication-dbus.c
@@ -339,7 +339,7 @@ gtk_application_impl_dbus_inhibit (GtkApplicationImpl         *impl,
                                 "Inhibit",
                                 g_variant_new ("(s@usu)",
                                                dbus->app_id,
-                                               gtk_application_impl_dbus_get_window_system_id (dbus, window),
+                                               window ? gtk_application_impl_dbus_get_window_system_id (dbus, window) : 0,
                                                reason,
                                                flags),
                                 G_DBUS_CALL_FLAGS_NONE,