xfs: use uuid_copy() helper to abstract uuid_t
uuid_t definition is about to change. Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NBrian Foster <bfoster@redhat.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
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