Mesa Kopper swapchain race fix

diff --git a/src/gallium/drivers/zink/zink_kopper.c b/src/gallium/drivers/zink/zink_kopper.c
index 569215eef1d..ddc486d6472 100644
--- a/src/gallium/drivers/zink/zink_kopper.c
+++ b/src/gallium/drivers/zink/zink_kopper.c
@@ -325,6 +325,10 @@ update_swapchain(struct zink_screen *screen, struct kopper_displaytarget *cdt, u
    struct kopper_swapchain *cswap = kopper_CreateSwapchain(screen, cdt, w, h, &error);
    if (!cswap)
       return error;
+
+   if (util_queue_is_initialized(&screen->flush_queue))
+      util_queue_finish(&screen->flush_queue);
+
    destroy_swapchain(screen, cdt->old_swapchain);
    cdt->old_swapchain = cdt->swapchain;
    cdt->swapchain = cswap;