[SCSI] zfcp: Replace local reference counting with common kref
Replace the local reference counting by already available mechanisms offered by kref. Where possible existing device structures were used, including the same functionality. Signed-off-by: NSwen Schillig <swen@vnet.ibm.com> Signed-off-by: NChristof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
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