Al's current changes to struct nameidata broke nfsroot for my discless
clients (oops in nfs_fill_super).  The patch below fixes this problem
for me.

Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>