[gtk+] range: simplify calculation

[Cosimo Cecchi <cosimoc src gnome org>]

commit 27a6183b98e3769a15add5dc0ef0ed7cbb6b65bc
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Mar 5 19:08:14 2016 -0800

    range: simplify calculation

 gtk/gtkrange.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 0377707..c80f8b7 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -2753,7 +2753,7 @@ gtk_range_multipress_gesture_pressed (GtkGestureMultiPress *gesture,
                         x - slider_alloc.width);
 
       /* compute new value for warped slider */
-      new_value = slider_low_value + (slider_high_value - slider_low_value) / 2;
+      new_value = (slider_low_value + slider_high_value) / 2;
 
       gtk_range_compute_slider_position (range, new_value, &slider);
       update_initial_slider_position (range, x, y, &slider);