xfs: refactor xfs_file_iomap_begin_delay
Rejuggle the return path to prepare for filling out a source iomap. Signed-off-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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