[mutter] clutter/xsettings-client: Zero-initialize stack struct

[Marge Bot <marge-bot src gnome org>]

commit 8afae2ebafbe4c4db22100111bbf7f9dccd82246
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri May 14 12:05:25 2021 +0200

    clutter/xsettings-client: Zero-initialize stack struct
    
    This fixes a warning/error:
    
    In function 'parse_settings',
        inlined from 'read_settings' at ../clutter/clutter/x11/xsettings/xsettings-client.c:398:25:
    ../clutter/clutter/x11/xsettings/xsettings-client.c:202:13: error: 'buffer.byte_order' may be used 
uninitialized [-Werror=maybe-uninitialized]
      202 |   if (buffer.byte_order != MSBFirst &&
          |       ~~~~~~^~~~~~~~~~~
    
    This is needed to bump the CI image from F33 to F34, which includes a
    upgraded compiler.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1865>

 clutter/clutter/x11/xsettings/xsettings-client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/clutter/clutter/x11/xsettings/xsettings-client.c 
b/clutter/clutter/x11/xsettings/xsettings-client.c
index f231499013..120809c659 100644
--- a/clutter/clutter/x11/xsettings/xsettings-client.c
+++ b/clutter/clutter/x11/xsettings/xsettings-client.c
@@ -185,7 +185,7 @@ static XSettingsList *
 parse_settings (unsigned char *data,
                size_t         len)
 {
-  XSettingsBuffer buffer;
+  XSettingsBuffer buffer = { 0 };
   XSettingsResult result = XSETTINGS_SUCCESS;
   XSettingsList *settings = NULL;
   CARD32 serial;