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Move zero copy feature check into _add_ublk_dev() since we will have more tests which requires to cover zero copy. Then one check function of _check_add_dev() has to be added for dealing with cleanup since '_add_ublk_dev()' is run in sub-shell, and we can't exit from it to terminal shell. Meantime always return error code from _add_ublk_dev(). Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-8-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>