[gtk+] style context: Don't leak a widget path

[Matthias Clasen <matthiasc src gnome org>]

commit 39e3b3a483f8a5ef7252c45f6079d672e23b9fcd
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Nov 17 20:22:42 2016 -0500

    style context: Don't leak a widget path
    
    Found by valgrind.

 gtk/gtkstylecontext.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkstylecontext.c b/gtk/gtkstylecontext.c
index df934e0..09c0a1b 100644
--- a/gtk/gtkstylecontext.c
+++ b/gtk/gtkstylecontext.c
@@ -1389,6 +1389,8 @@ _gtk_style_context_peek_style_property (GtkStyleContext *context,
                                                  gtk_widget_path_iter_get_state (path, -1),
                                                  pspec, &pcache->value))
         {
+          gtk_widget_path_unref (path);
+
           return &pcache->value;
         }
     }