loop: Fix discard_alignment default setting
discard_alignment is not relevant to the loop driver since it is supposed to be set as a workaround for the old sector 63 alignments. So set it to zero rather than block size. Signed-off-by: NLukas Czerner <lczerner@redhat.com> Reported-by: NMilan Broz <mbroz@redhat.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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