[gtk+] Fix a typo

[Matthias Clasen <matthiasc src gnome org>]

commit aa5afb38e83937aff9d9a14800c633960dde2d67
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 13 23:04:08 2014 -0400

    Fix a typo
    
    A getter shouldn't return void.

 gtk/gtkadjustment.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkadjustment.c b/gtk/gtkadjustment.c
index 0bcb2b7..74541a8 100644
--- a/gtk/gtkadjustment.c
+++ b/gtk/gtkadjustment.c
@@ -1012,7 +1012,7 @@ gtk_adjustment_enable_animation (GtkAdjustment *adjustment,
   priv->duration = duration; 
 }
 
-void
+guint
 gtk_adjustment_get_animation_duration (GtkAdjustment *adjustment)
 {
   return adjustment->priv->duration;