[gtk+] css: Fix radial-gradient() color stop computation

[Benjamin Otte <otte src gnome org>]

commit 6dddf0447e4f4462c9568a1c506ee621e933990e
Author: Benjamin Otte <otte redhat com>
Date:   Wed Nov 2 15:19:49 2016 +0100

    css: Fix radial-gradient() color stop computation
    
    The copy/paste from the linear gradient code had an error.

 gtk/gtkcssimageradial.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcssimageradial.c b/gtk/gtkcssimageradial.c
index 81967c9..4ae4344 100644
--- a/gtk/gtkcssimageradial.c
+++ b/gtk/gtkcssimageradial.c
@@ -197,7 +197,7 @@ gtk_css_image_radial_draw (GtkCssImage *image,
         pos = _gtk_css_number_value_get (stop->offset, radius) / radius;
 
       pos = MAX (pos, 0);
-      step = pos / (i - last);
+      step = (pos - offset) / (i - last);
       for (last = last + 1; last <= i; last++)
         {
           const GdkRGBA *rgba;