clutter-stage-cogl: Match EGL's behavior of eglSwapBuffersWithDamage

-1 is explicitly an invalid value to pass to eglSwapBuffersWithDamage,
and the specification admits as much:

                                                         If
    eglSwapBuffersWithDamageEXT is called and <n_rects>, is less
    than zero or <n_rects> is greater than zero but <rects> is
    NULL, EGL_BAD_PARAMETER is generated.

Fix up our usage of SwapBuffersWithDamage to match the behavior in the
EGL specification.

https://bugzilla.gnome.org/show_bug.cgi?id=745512

clutter/cogl/clutter-stage-cogl.c

@@ -607,11 +607,7 @@ clutter_stage_cogl_redraw (ClutterStageWindow *stage_window)
     }
   else
     {
-      damage[0] = 0;
-      damage[1] = 0;
-      damage[2] = geom.width;
-      damage[3] = geom.height;
-      ndamage = -1;
+      ndamage = 0;
     }
 
   /* push on the screen */