[SCSI] zfcp: Access ports and units with container_of in sysfs code
When accessing port and unit attributes, use container_of instead of dev_get_drvdata. This eliminates some code checker warnings about aliased access of data structures. Reviewed-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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