[gtk+] label: Remove some useless casts

[Timm Bäder <baedert src gnome org>]

commit 57ef6312166537e9145088d576dc3a60bac81ca2
Author: Timm Bäder <mail baedert org>
Date:   Tue Aug 9 15:13:01 2016 +0200

    label: Remove some useless casts
    
    These were casts of a const GdkEvent* to GdkEvent* even though the
    function they are passed to takes a const GdkEvent*.

 gtk/gtklabel.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index 649ac2c..3f382e0 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -6661,8 +6661,8 @@ gtk_label_do_popup (GtkLabel       *label,
 
   g_signal_emit (label, signals[POPULATE_POPUP], 0, menu);
 
-  if (event && gdk_event_triggers_context_menu ((GdkEvent *) event))
-    gtk_menu_popup_at_pointer (GTK_MENU (menu), (GdkEvent *) event);
+  if (event && gdk_event_triggers_context_menu (event))
+    gtk_menu_popup_at_pointer (GTK_MENU (menu), event);
   else
     {
       gtk_menu_popup_at_widget (GTK_MENU (menu),