[SCSI] fix the return value of scsi_target_queue_read()
It seems that zero should be returned if scsi_target_is_busy(starget) is true, no matter if sdev is on the starved list. Signed-off-by: NHillf Danton <dhillf@gmail.com> Reviewed-by: NMike Christie <michaelc@cs.wisc.edu> Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
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