util: Remove superfluous GtkWindow cast check

1 files changed, 1 insertions, 1 deletions

diff --git a/src/util.c b/src/util.c
index ae3067c..1344013 100644
--- a/src/util.c
+++ b/src/util.c
@@ -468,7 +468,7 @@ zenity_util_gapp_quit (GtkWindow *window, ZenityData *data)
 	if (data->exit_code != 0)
 		exit (data->exit_code);
 
-	if (window && GTK_IS_WINDOW (window))
+	if (window)
 		gtk_window_destroy (window);
 	else
 		g_application_release (g_application_get_default ());