[SCSI] scsi_scan: Cope with kthread_run failing
If kthread_run failed, we would fail to scan the host, and leak the allocated async_scan_data. Since using a separate thread is just an optimisation, do the scan synchronously if we fail to spawn a thread. Signed-off-by: NMatthew Wilcox <matthew@wil.cx> Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
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