From: James Morris <jmorris@intercode.com.au>

This patch against current bk removes anon_hash_chain from fs/inode.c, as
all inodes in the 2.5 kernel must be associated with a superblock, and the
anon hash is no longer needed.

(akpm: Well there's one inode with a null i_sb: swapper_inode.  But it
shouldn't get here and if it does, we'll fix it by other means).