[gtk+] x11: Add the same message as the wayland backend has

[Matthias Clasen <matthiasc src gnome org>]

commit 95c7de70c70951ee5d1def390e51b0569c08c970
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 17 15:27:15 2016 -0400

    x11: Add the same message as the wayland backend has
    
    This seems prudent, if we make noise about missing cursors
    on Wayland, we should do the same on X11.

 gdk/x11/gdkcursor-x11.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gdk/x11/gdkcursor-x11.c b/gdk/x11/gdkcursor-x11.c
index 7f14873..1895ba9 100644
--- a/gdk/x11/gdkcursor-x11.c
+++ b/gdk/x11/gdkcursor-x11.c
@@ -704,7 +704,10 @@ _gdk_x11_display_get_cursor_for_name (GdkDisplay  *display,
             }
         }
       if (xcursor == None)
-        return NULL;
+        {
+          g_message ("Unable to load %s from the cursor theme", name);
+          return NULL;
+        }
     }
 
   private = g_object_new (GDK_TYPE_X11_CURSOR,