[mutter] frames: default theme variant now is set as empty string

[Alberts Muktupāvels <muktupavels src gnome org>]

commit e5ce6192f47173888cbb153ddeeccf7722bb84b1
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Feb 4 15:23:16 2016 +0200

    frames: default theme variant now is set as empty string
    
    Related change in GTK+:
    https://git.gnome.org/browse/gtk+/commit/?id=8eb261988869608604c78ed90de5579beb4ef2b0
    
    https://bugzilla.gnome.org/show_bug.cgi?id=761543

 src/ui/frames.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/ui/frames.c b/src/ui/frames.c
index 961ecac..b7f6ab9 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -486,7 +486,7 @@ meta_ui_frame_attach_style (MetaUIFrame *frame)
   else
     variant = frame->meta_window->gtk_theme_variant;
 
-  if (variant == NULL || strcmp(variant, "normal") == 0)
+  if (variant == NULL || *variant == '\0')
     frame->style_info = meta_style_info_ref (frames->normal_style);
   else
     frame->style_info = meta_style_info_ref (meta_frames_get_theme_variant (frames,