xfs: pass a struct xfs_bmbt_irec to xfs_bmbt_lookup_eq

xfs: pass a struct xfs_bmbt_irec to xfs_bmbt_lookup_eq

Source kernel commit: e16cf9b03cee4d2797695d4ca691e854c7a24864

Now that we've massaged the callers into the right form we can always
pass the actual extent record instead of the individual fields.

As an additional benefit the btree cursor will now be prepoulated with
the correct extent state instead of having to fix it up later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>