[gnome-calendar] event-widget: fix memory leak

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit be731fcae70352ab2375f51f530e60482ba42863
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Fri May 12 21:07:03 2017 +0530

    event-widget: fix memory leak
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782566

 src/gcal-event-widget.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/gcal-event-widget.c b/src/gcal-event-widget.c
index 24b0c7a..6376fee 100644
--- a/src/gcal-event-widget.c
+++ b/src/gcal-event-widget.c
@@ -903,6 +903,7 @@ get_dnd_icon (GtkWidget *widget)
   cr = cairo_create (surface);
 
   gtk_widget_draw (widget, cr);
+  cairo_destroy (cr);
 
   return surface;
 }