[gtk+] coloreditor: Update to using GdkEvent API

[Carlos Garnacho <carlosg src gnome org>]

commit a46173980e68e936431ac7cac0bba8e35603e427
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Aug 25 16:44:29 2017 +0200

    coloreditor: Update to using GdkEvent API

 gtk/gtkcoloreditor.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcoloreditor.c b/gtk/gtkcoloreditor.c
index e23fcab..b43a0f2 100644
--- a/gtk/gtkcoloreditor.c
+++ b/gtk/gtkcoloreditor.c
@@ -232,7 +232,10 @@ popup_key_press (GtkWidget      *popup,
                  GdkEventKey    *event,
                  GtkColorEditor *editor)
 {
-  if (event->keyval == GDK_KEY_Escape)
+  guint keyval;
+
+  if (gdk_event_get_keyval ((GdkEvent *) event, &keyval) &&
+      keyval == GDK_KEY_Escape)
     {
       dismiss_current_popup (editor);
       return TRUE;