[XFS] kill shouty XFS_ITOV_NULL macro

Replace XFS_ITOV_NULL() with the new VFS_I() inline.

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31722a

Signed-off-by: David Chinner <[email protected]>
Signed-off-by: Niv Sardi <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Lachlan McIlroy <[email protected]>
6 files changed