[gtk+] AccelLabel: set_accel_closure() arg is nullable

[Daniel Boles <dboles src gnome org>]

commit e29f39b66cfeb82d4a5f7ce0ff1eee94c57916a2
Author: Daniel Boles <dboles src gnome org>
Date:   Mon Aug 7 10:32:13 2017 +0100

    AccelLabel: set_accel_closure() arg is nullable

 gtk/gtkaccellabel.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkaccellabel.c b/gtk/gtkaccellabel.c
index a383e03..862c77a 100644
--- a/gtk/gtkaccellabel.c
+++ b/gtk/gtkaccellabel.c
@@ -553,16 +553,20 @@ check_accel_changed (GtkAccelGroup  *accel_group,
 /**
  * gtk_accel_label_set_accel_closure:
  * @accel_label: a #GtkAccelLabel
- * @accel_closure: the closure to monitor for accelerator changes.
+ * @accel_closure: (nullable): the closure to monitor for accelerator changes,
+ * or %NULL
  *
  * Sets the closure to be monitored by this accelerator label. The closure
  * must be connected to an accelerator group; see gtk_accel_group_connect().
+ * Passing %NULL for @accel_closure will dissociate @accel_label from its
+ * current closure, if any.
  **/
 void
 gtk_accel_label_set_accel_closure (GtkAccelLabel *accel_label,
                                   GClosure      *accel_closure)
 {
   g_return_if_fail (GTK_IS_ACCEL_LABEL (accel_label));
+
   if (accel_closure)
     g_return_if_fail (gtk_accel_group_from_accel_closure (accel_closure) != NULL);
 
@@ -576,7 +580,9 @@ gtk_accel_label_set_accel_closure (GtkAccelLabel *accel_label,
          accel_label->priv->accel_group = NULL;
          g_closure_unref (accel_label->priv->accel_closure);
        }
+
       accel_label->priv->accel_closure = accel_closure;
+
       if (accel_label->priv->accel_closure)
        {
          g_closure_ref (accel_label->priv->accel_closure);
@@ -585,6 +591,7 @@ gtk_accel_label_set_accel_closure (GtkAccelLabel *accel_label,
                                   G_CALLBACK (check_accel_changed),
                                   accel_label, 0);
        }
+
       gtk_accel_label_reset (accel_label);
       g_object_notify_by_pspec (G_OBJECT (accel_label), props[PROP_ACCEL_CLOSURE]);
     }