[gtk+] testgtk: Fix compilation warning

[Javier Jardón <jjardon src gnome org>]

commit b1a0a08d946eece89260570288e3f0890ad3f1f7
Author: Javier Jardón <jjardon gnome org>
Date:   Sun Feb 13 14:21:12 2011 +0000

    testgtk: Fix compilation warning

 tests/testgtk.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tests/testgtk.c b/tests/testgtk.c
index b704c6f..e218614 100644
--- a/tests/testgtk.c
+++ b/tests/testgtk.c
@@ -2426,6 +2426,8 @@ grippy_draw (GtkWidget *area, cairo_t *cr, GdkWindowEdge edge)
     case GDK_WINDOW_EDGE_SOUTH_EAST:
       sides = GTK_JUNCTION_CORNER_BOTTOMRIGHT;
       break;
+    default:
+      g_assert_not_reached();
     }
 
   context = gtk_widget_get_style_context (area);