LU-13399 lfsck: tune lfsck repair message

namespace LFSCK repair the shard N message printed
even there was nothing to repair which is confusing.

HPE-bug-id: LUS-8548
Signed-off-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Change-Id: I34cc79f59eb76c1f6a86baeed81f8372c133b746
Reviewed-on: https://review.whamcloud.com/38100
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>