[gtk] cssprovider: Fix compilation wth VERIFY_TREE set

[Timm Bäder <baedert src gnome org>]

commit 3073e6585129e013170ea518152345c7883a70fa
Author: Timm Bäder <mail baedert org>
Date:   Wed Aug 21 11:19:35 2019 +0200

    cssprovider: Fix compilation wth VERIFY_TREE set

 gtk/gtkcssprovider.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index 4943be01f1..3ea1669b2d 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -407,7 +407,7 @@ verify_tree_match_results (GtkCssProvider *provider,
                           GPtrArray *tree_rules)
 {
 #ifdef VERIFY_TREE
-  GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (css_provider);
+  GtkCssProviderPrivate *priv = gtk_css_provider_get_instance_private (provider);
   GtkCssRuleset *ruleset;
   gboolean should_match;
   int i, j;