xfs: limit xfs_imap_to_bmap to a single mapping
We only call xfs_iomap for single mappings anyway, so remove all code dealing with multiple mappings from xfs_imap_to_bmap and add asserts that we never get results that we do not expect. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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