dm snapshot: avoid else clause in persistent_read_metadata
Minor code touch-up. We don't need the 'else'. Signed-off-by: NJonathan Brassow <jbrassow@redhat.com> Reviewed-by: NMikulas Patocka <mpatocka@redhat.com> Reviewed-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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