[gtk+] entry: handle NULL cursor when releasing reference

[Christian Hergert <chergert src gnome org>]

commit 7ecd3378771f2aab230cd53f191ff4f6b9474699
Author: Christian Hergert <chergert redhat com>
Date:   Tue Sep 27 14:09:02 2016 -0700

    entry: handle NULL cursor when releasing reference
    
    If we happen to have gotten NULL back for a cursor, then we
    need to check before unreffing it.

 gtk/gtkentry.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkentry.c b/gtk/gtkentry.c
index 35f9e69..cfe79a7 100644
--- a/gtk/gtkentry.c
+++ b/gtk/gtkentry.c
@@ -3364,7 +3364,7 @@ gtk_entry_realize (GtkWidget *widget)
   gtk_widget_register_window (widget, priv->text_area);
 
   if (attributes_mask & GDK_WA_CURSOR)
-    g_object_unref (attributes.cursor);
+    g_clear_object (&attributes.cursor);
 
   gtk_im_context_set_client_window (priv->im_context, priv->text_area);