[gnome-builder/gnome-builder-3-18] workspace: use g_return_if_reached()

[Christian Hergert <chergert src gnome org>]

commit 52093643933de0aa83b5f54b098e81963bef4a64
Author: Christian Hergert <chergert redhat com>
Date:   Sat Oct 10 23:27:18 2015 -0400

    workspace: use g_return_if_reached()
    
    This doesn't get compiled out in optimized builds, so it is more useful
    for us to use this than the assertion to avoid a gcc warning.

 src/workspace/gb-slider.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/workspace/gb-slider.c b/src/workspace/gb-slider.c
index 61ade5e..4b34e7c 100644
--- a/src/workspace/gb-slider.c
+++ b/src/workspace/gb-slider.c
@@ -897,8 +897,7 @@ gb_slider_set_position (GbSlider         *self,
           break;
 
         default:
-          g_assert_not_reached ();
-          break;
+          g_return_if_reached ();
         }
 
       frame_clock = gtk_widget_get_frame_clock (GTK_WIDGET (self));