vulkan/wsi: Destroy swapchain images after terminating FIFO queues

The queue_manager thread can access the images from x11_present_to_x11,
hence this reorder prevents dereferencing of dangling pointers.

Cc: "18.1" <mesa-stable@lists.freedesktop.org>
Fixes: e73d136a02 ("vulkan/wsi/x11: Implement FIFO mode.")
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/vulkan/wsi/wsi_common_x11.c

@@ -1235,9 +1235,6 @@ x11_swapchain_destroy(struct wsi_swapchain *anv_chain,
    struct x11_swapchain *chain = (struct x11_swapchain *)anv_chain;
    xcb_void_cookie_t cookie;
 
-   for (uint32_t i = 0; i < chain->base.image_count; i++)
-      x11_image_finish(chain, pAllocator, &chain->images[i]);
-
    if (chain->threaded) {
       chain->status = VK_ERROR_OUT_OF_DATE_KHR;
       /* Push a UINT32_MAX to wake up the manager */
@@ -1247,6 +1244,9 @@ x11_swapchain_destroy(struct wsi_swapchain *anv_chain,
       wsi_queue_destroy(&chain->present_queue);
    }
 
+   for (uint32_t i = 0; i < chain->base.image_count; i++)
+      x11_image_finish(chain, pAllocator, &chain->images[i]);
+
    xcb_unregister_for_special_event(chain->conn, chain->special_event);
    cookie = xcb_present_select_input_checked(chain->conn, chain->event_id,
                                              chain->window,