mm/zswap: use postorder iteration when destroying rbtree
mm/zswap: use postorder iteration when destroying rbtree

Signed-off-by: Cody P Schafer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@linux.vnet.ibm.com>
Reviewed-by: Seth Jennings <527af9e7c640877508ac9f4ddd8647c066bca6c6@linux.vnet.ibm.com>
Cc: David Woodhouse <b460d66aaf00c296a3db1c1d9eeafc081d5f7d70@intel.com>
Cc: Rik van Riel <a21938f5d463ddf41aa718934c205ca2cce8ebbc@redhat.com>
Cc: Michel Lespinasse <6a4cf9207bb95b1a4cf1be22c2e93f8b38036f65@google.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs