[gtk] inspector: Remove unnecessary cast

[Carlos Garnacho <carlosg src gnome org>]

commit a8c6f222edd7bdb495b09184331ab3f6335412d7
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Jul 30 14:19:07 2018 +0200

    inspector: Remove unnecessary cast
    
    Pointed out by Timm.

 gtk/inspector/inspect-button.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/inspector/inspect-button.c b/gtk/inspector/inspect-button.c
index 5e58cb1008..5fa28f25d3 100644
--- a/gtk/inspector/inspect-button.c
+++ b/gtk/inspector/inspect-button.c
@@ -358,7 +358,7 @@ gtk_inspector_on_inspect (GtkWidget          *button,
                    G_CALLBACK (property_query_pressed), iw);
   gtk_widget_add_controller (iw->invisible, controller);
 
-  controller = GTK_EVENT_CONTROLLER (gtk_event_controller_motion_new ());
+  controller = gtk_event_controller_motion_new ();
   g_signal_connect (controller, "motion",
                     G_CALLBACK (property_query_motion), iw);
   gtk_widget_add_controller (iw->invisible, controller);