From: "J. Bruce Fields" <bfields@fieldses.org>
From: Neil Brown <neilb@cse.unsw.edu.au>

This fixes an oops on unmount (failure of the assertation at
fs/ext3/super.c:421).  Probably reproduceable just by creating and deleting a
single symlink over nfs and then unmounting the exported filesystem.

Recent change to fh_compose means dentry reference is *not* consumed, and so
usually has to be explicitly dput afterwards.  One usage was missed in that
patch, so this dput is needed.
Signed-off-by: Andrew Morton <akpm@osdl.org>