loop: remove redundant __GFP_NOWARN flag GFP_NOWAIT already includes __GFP_NOWARN, so let's remove the redundant __GFP_NOWARN. Signed-off-by: Pedro Demarchi Gomes <pedrodemargomes@gmail.com> Reviewed-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>