revert cc57c073 "configfs: fix registered group removal"
It was an attempt to handle something that fundamentally doesn't
work - configfs_register_group() should never be done in a part
of tree that can be rmdir'ed.  And in mainline it never had been,
so let's not borrow trouble; the fix was racy anyway, it would take
a lot more to make that work and desired semantics is not clear.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NChristoph Hellwig <hch@lst.de>