[PATCH] USB: Fix hiddev devfs oops

[PATCH] USB: Fix hiddev devfs oops

From: Herbert Xu <herbert@gondor.apana.org.au>

There is a long-standing devfs_unregister oops in hid/hiddev.  It's caused
by hid calling hiddev_exit before unregistering itself which in turn calls
hiddev_disconnect.

hiddev_exit removes the directory which contains the hiddev devices.
Therefore it needs to be called after the hiddev devices have been
disconnected.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>