rescan-scsi-bus: sgdevice26: do not traverse sg class if scsi_device isnot added #21
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For system which has a massive number of scsi_devices, it would takes a long time to
traverse /sys/class/scsi_generic to find a related sg. If the scsi_device of specific
scsiid host:channel:target:lun did not added, the traverse would find no sg neither.
Signed-off-by: Wenchao Hao haowenchao@huawei.com