radv: don't crash on null swapchain destroy.

Just return if the passed in swapchain is NULL.

Fixes: dEQP-VK.wsi.xlib.swapchain.destroy.null_handle

Cc: "13.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
1 file changed