[gtk+] Remove unnecessary introspection annotation

[Emmanuele Bassi <ebassi src gnome org>]

commit 6c0de43669bd37d6734dcc76a63276cd7618bc38
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Dec 21 18:46:08 2017 +0000

    Remove unnecessary introspection annotation
    
    Transfer annotations do not apply to integral types.

 gdk/x11/gdkdisplay-x11.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/x11/gdkdisplay-x11.c b/gdk/x11/gdkdisplay-x11.c
index 976b0a5..5b1b884 100644
--- a/gdk/x11/gdkdisplay-x11.c
+++ b/gdk/x11/gdkdisplay-x11.c
@@ -2142,7 +2142,7 @@ gdk_x11_display_get_xscreen (GdkDisplay *display)
  *
  * Returns the root X window used by #GdkDisplay.
  *
- * Returns: (transfer none): an X Window
+ * Returns: an X Window
  *
  * Since: 3.94
  */