[gtk+] gtkdnd: Plug a leak

[Carlos Garnacho <carlosg src gnome org>]

commit 0606b525b47cf0901ebff70c8aebd57f8190e116
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jun 25 14:58:00 2015 +0200

    gtkdnd: Plug a leak
    
    We create a cairo_t in order to find out the surface extents, but it
    was being leaked, dragging the whole drag surface with it through
    extra refs.

 gtk/gtkdnd.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
index 56fcc25..3f63d5b 100644
--- a/gtk/gtkdnd.c
+++ b/gtk/gtkdnd.c
@@ -3275,6 +3275,7 @@ _gtk_cairo_surface_extents (cairo_surface_t *surface,
 
   cr = cairo_create (surface);
   cairo_clip_extents (cr, &x1, &y1, &x2, &y2);
+  cairo_destroy (cr);
 
   x1 = floor (x1);
   y1 = floor (y1);