[metacity] frames: fix double free introduced in previous commit ...

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 649f588ce99ca2962291ce43b5708573ae99b9aa
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 4 02:22:03 2015 +0300

    frames: fix double free introduced in previous commit ...
    
    ... b0fb6df3ab09995c4d35dfb49f30aeb711239806

 src/ui/frames.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/ui/frames.c b/src/ui/frames.c
index 09b3aea..d30e221 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -668,7 +668,8 @@ meta_frames_attach_style (MetaFrames  *frames,
     frame->style_info = meta_style_info_ref (meta_frames_get_theme_variant (frames,
                                                                             variant));
 
-  g_free (variant);
+  if (variant_override)
+    g_free (variant);
 }
 
 void