squash -Wunused-parameter warning in btn_twopi_clicked

diff --git a/cmd/smyrna/gui/callbacks.c b/cmd/smyrna/gui/callbacks.c
index dec48f2e90bc42822042e6456003fb31956afccf..2287b379891373dacb42b6373739f2c1e368fc7a 100644 (file)
--- a/cmd/smyrna/gui/callbacks.c
+++ b/cmd/smyrna/gui/callbacks.c
@@ -93,6 +93,8 @@ void btn_neato_clicked(GtkWidget * widget, gpointer user_data)
 
 void btn_twopi_clicked(GtkWidget * widget, gpointer user_data)
 {
+    (void)user_data;
+
     btn_clicked(widget, GVK_TWOPI);
 }