[clutter] base-types: Don't free zero point and rect

[Emmanuele Bassi <ebassi src gnome org>]

commit 5eb07a301060225e2e33d7d8c5a61003dda7714d
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Sat Jun 9 10:38:09 2012 +0100

    base-types: Don't free zero point and rect
    
    Calling clutter_point_free(clutter_point_zero()) or calling
    clutter_rect_free(clutter_rect_zero()) should be safe, exactly like it's
    safe to call those functions with a NULL argument.

 clutter/clutter-base-types.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/clutter/clutter-base-types.c b/clutter/clutter-base-types.c
index ac5bc73..32ed407 100644
--- a/clutter/clutter-base-types.c
+++ b/clutter/clutter-base-types.c
@@ -466,7 +466,7 @@ clutter_point_copy (const ClutterPoint *point)
 void
 clutter_point_free (ClutterPoint *point)
 {
-  if (point != NULL)
+  if (point != NULL && point != &_clutter_point_zero)
     g_slice_free (ClutterPoint, point);
 }
 
@@ -840,7 +840,7 @@ clutter_rect_copy (const ClutterRect *rect)
 void
 clutter_rect_free (ClutterRect *rect)
 {
-  if (rect != NULL)
+  if (rect != NULL && rect != &_clutter_rect_zero)
     g_slice_free (ClutterRect, rect);
 }