xfs: replace no-op firstblock init with ->t_firstblock
xfs_refcount_recover_cow_leftovers() has no need for a firstblock variable and so passes an unrelated xfs_fsblock_t to xfs_defer_init() to avoid declaring one. Replace this no-op initialization with ->t_firstblock. This will be optimized away by the removal of the xfs_defer_init() firstblock param. Signed-off-by: NBrian Foster <bfoster@redhat.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
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