target: simplify XCOPY wwn->se_dev lookup helper
target_xcopy_locate_se_dev_e4() is used to locate an se_dev, based on the WWN provided with the XCOPY request. Remove a couple of unneeded arguments, and rely on the caller for the src/dst test. Signed-off-by: David Disseldorp <ddiss@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
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