Plug request_key_auth memleak.  This can be triggered by unprivileged
users, so is local DoS.
Signed-off-by: NChris Wright <chrisw@osdl.org>
Signed-Off-By: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>