[SCSI] do not manipulate device reference counts in scsi_get/put_command
Many callers won't need this and we can optimize them away. In addition the handling in the __-prefixed variants was inconsistant to start with. Based on an earlier patch from Bart Van Assche. [jejb: fix kerneldoc probelm picked up by Fengguang Wu] Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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