[gtk+] scale: Remove double nullable annotation

[Timm Bäder <baedert src gnome org>]

commit 20592a79350dd331f99f3345e23f7f9d85046043
Author: Timm Bäder <mail baedert org>
Date:   Tue May 10 12:50:42 2016 +0200

    scale: Remove double nullable annotation
    
    Being both (allow-none) and (nullable) at the same time is a bit much.
    Was from 591e7f5ef8538982e227b2c2cefc536a33cafa6c.

 gtk/gtkscale.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkscale.c b/gtk/gtkscale.c
index 8b22cc0..2223d37 100644
--- a/gtk/gtkscale.c
+++ b/gtk/gtkscale.c
@@ -1016,7 +1016,7 @@ gtk_scale_get_property (GObject      *object,
 /**
  * gtk_scale_new:
  * @orientation: the scale’s orientation.
- * @adjustment: (allow-none) (nullable): the #GtkAdjustment which sets the range
+ * @adjustment: (nullable): the #GtkAdjustment which sets the range
  *              of the scale, or %NULL to create a new adjustment.
  *
  * Creates a new #GtkScale.