wayland: Avoid NULL slave devices in GdkSeat::get_slaves

Just because we're asked for a capability, it doesn't mean we have
it.

diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index 34004baf0b171d7bf4f504772d9317ce2c20de7c..3f2bafedc97ad3f68c806f6345b319e71f4def4d 100644 (file)
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -2893,11 +2893,11 @@ gdk_wayland_seat_get_slaves (GdkSeat             *seat,
   GdkWaylandSeat *wayland_seat = GDK_WAYLAND_SEAT (seat);
   GList *slaves = NULL;
 
-  if (capabilities & GDK_SEAT_CAPABILITY_POINTER)
+  if (wayland_seat->pointer && (capabilities & GDK_SEAT_CAPABILITY_POINTER))
     slaves = g_list_prepend (slaves, wayland_seat->pointer);
-  if (capabilities & GDK_SEAT_CAPABILITY_KEYBOARD)
+  if (wayland_seat->keyboard && (capabilities & GDK_SEAT_CAPABILITY_KEYBOARD))
     slaves = g_list_prepend (slaves, wayland_seat->keyboard);
-  if (capabilities & GDK_SEAT_CAPABILITY_TOUCH)
+  if (wayland_seat->touch && (capabilities & GDK_SEAT_CAPABILITY_TOUCH))
     slaves = g_list_prepend (slaves, wayland_seat->touch);
 
   return slaves;