examples/link-cp: fix a few issues
examples/link-cp: fix a few issues

Still need to handle broken chains, must resubmit those.

Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing