[gtk+] styleprovider: Fix fallout from merge

[Benjamin Otte <otte src gnome org>]

commit 941a621ea9b7838abb396cdc461fa525cd4e606a
Author: Benjamin Otte <otte redhat com>
Date:   Tue Oct 31 06:17:40 2017 +0100

    styleprovider: Fix fallout from merge
    
    StyleProvider should inherit from GObject, not from itself.

 gtk/gtkstyleprovider.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkstyleprovider.c b/gtk/gtkstyleprovider.c
index 032e9bd..3fb0f49 100644
--- a/gtk/gtkstyleprovider.c
+++ b/gtk/gtkstyleprovider.c
@@ -38,7 +38,7 @@ enum {
   LAST_SIGNAL
 };
 
-G_DEFINE_INTERFACE (GtkStyleProvider, gtk_style_provider, GTK_TYPE_STYLE_PROVIDER)
+G_DEFINE_INTERFACE (GtkStyleProvider, gtk_style_provider, G_TYPE_OBJECT)
 
 static guint signals[LAST_SIGNAL];