[PATCH] Fix infinite loop in xwl_screen_post_damage

[timon37]

Happens when first two windows are damaged, then later one is damaged and
the other is unrealized. It makes the damaged windows next point to itself.

Triggers most often on menus or tooltips.
---
 hw/xfree86/xwayland/xwayland-window.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/hw/xfree86/xwayland/xwayland-window.c b/hw/xfree86/xwayland/xwayland-window.c
index e58350f..bc444af 100644
--- a/hw/xfree86/xwayland/xwayland-window.c
+++ b/hw/xfree86/xwayland/xwayland-window.c
@@ -218,7 +218,7 @@ xwl_unrealize_window(WindowPtr window)
 {
     ScreenPtr screen = window->drawable.pScreen;
     struct xwl_screen *xwl_screen;
-    struct xwl_window *xwl_window;
+    struct xwl_window *xwl_window, *iter, *tmp;
     struct xwl_input_device *xwl_input_device;
     Bool ret;
 
@@ -248,7 +248,14 @@ xwl_unrealize_window(WindowPtr window)
 	wl_buffer_destroy(xwl_window->buffer);
     wl_surface_destroy(xwl_window->surface);
     xorg_list_del(&xwl_window->link);
-    xorg_list_del(&xwl_window->link_damage);
+    
+    xorg_list_for_each_entry_safe(iter, tmp,
+			     &xwl_screen->damage_window_list, link_damage) {
+	if (iter == xwl_window) {
+	    xorg_list_del(&xwl_window->link_damage);
+	    break;
+	}
+    }
     DamageUnregister(&window->drawable, xwl_window->damage);
     DamageDestroy(xwl_window->damage);
     free(xwl_window);
-- 
1.7.8.5