[gtk+] range: fix warning for gadget slider

[Cosimo Cecchi <cosimoc src gnome org>]

commit 5a42c2e478ba21ca2d35cdc6c9c8b7afc7c6897f
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Fri Mar 4 17:28:04 2016 -0800

    range: fix warning for gadget slider
    
    The slider is not HFW/WFH - just pass -1 to get rid of the warnings.

 gtk/gtkrange.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 0bedf35..26f2fce 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -1837,7 +1837,7 @@ gtk_range_measure_trough (GtkCssGadget   *gadget,
   gint min, nat;
 
   gtk_css_gadget_get_preferred_size (priv->slider_gadget,
-                                     orientation, for_size,
+                                     orientation, -1,
                                      minimum, natural,
                                      NULL, NULL);