[mutter] wayland/keyboard: Fix anonymous file leak on repeated keymap changes

[Jonas Ådahl <jadahl src gnome org>]

commit 51a8193c16e05e3862e22fd086c5900d8422890c
Author: Sebastian Keller <skeller gnome org>
Date:   Mon Jun 8 10:02:49 2020 +0200

    wayland/keyboard: Fix anonymous file leak on repeated keymap changes
    
    keymap_rofile was being overwritten without the old one being free'd on
    repeated calls of meta_wayland_keyboard_take_keymap().
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1304

 src/wayland/meta-wayland-keyboard.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/wayland/meta-wayland-keyboard.c b/src/wayland/meta-wayland-keyboard.c
index dbc53c29fd..0824007ad3 100644
--- a/src/wayland/meta-wayland-keyboard.c
+++ b/src/wayland/meta-wayland-keyboard.c
@@ -147,6 +147,7 @@ meta_wayland_keyboard_take_keymap (MetaWaylandKeyboard *keyboard,
     }
   keymap_size = strlen (keymap_string) + 1;
 
+  g_clear_pointer (&xkb_info->keymap_rofile, meta_anonymous_file_free);
   xkb_info->keymap_rofile =
     meta_anonymous_file_new (keymap_size, (const uint8_t *) keymap_string);