[mutter] theme: Plug GtkIconInfo leak

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit c13ea4f48ddbb8dfe67acca8af2e07987040a616
Author: Sebastian Keller <skeller src gnome org>
Date:   Sun Jan 5 02:18:26 2020 +0100

    theme: Plug GtkIconInfo leak
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/991

 src/ui/theme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/ui/theme.c b/src/ui/theme.c
index 9b8ddff63..5f2b5fd8e 100644
--- a/src/ui/theme.c
+++ b/src/ui/theme.c
@@ -861,7 +861,7 @@ meta_frame_layout_draw_with_style (MetaFrameLayout         *layout,
           if (icon_name)
             {
               GtkIconTheme *theme = gtk_icon_theme_get_default ();
-              GtkIconInfo *info;
+              g_autoptr (GtkIconInfo) info = NULL;
               GdkPixbuf *pixbuf;
 
               info = gtk_icon_theme_lookup_icon_for_scale (theme, icon_name,