[gtk+/wip/alexl/rendertree] Use an internal parameter check here as well

[Matthias Clasen <matthiasc src gnome org>]

commit 72f6f123802f03f6c2acbb2ee49ac7a65e968c9b
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jan 10 19:52:22 2017 -0500

    Use an internal parameter check here as well
    
    We should not slow down the core parts of the css machinery
    with type checks.

 gtk/gtkcssnumbervalue.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcssnumbervalue.c b/gtk/gtkcssnumbervalue.c
index 54e1d1c..5348a20 100644
--- a/gtk/gtkcssnumbervalue.c
+++ b/gtk/gtkcssnumbervalue.c
@@ -22,6 +22,7 @@
 #include "gtkcsscalcvalueprivate.h"
 #include "gtkcssdimensionvalueprivate.h"
 #include "gtkcsswin32sizevalueprivate.h"
+#include "gtkprivate.h"
 
 struct _GtkCssValue {
   GTK_CSS_VALUE_BASE
@@ -164,7 +165,7 @@ _gtk_css_number_value_get (const GtkCssValue *number,
 {
   GtkCssNumberValueClass *number_value_class;
 
-  g_return_val_if_fail (number != NULL, 0.0);
+  gtk_internal_return_val_if_fail (number != NULL, 0.0);
 
   number_value_class = (GtkCssNumberValueClass *) number->class;