xfs: return a void pointer from xfs_buf_offset
This avoids all kinds of unessecary casts in an envrionment like Linux where we can assume that pointer arithmetics are support on void pointers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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