Btrfs: fix orphan cleanup regression

In fixing how we deal with bad inodes, we had a regression in the orphan cleanup
code, since it expects to get a bad inode back.  So fix it to deal with getting
-ESTALE back by deleting the orphan item manually and moving on.  Thanks,

Reported-by: Simon Kirby <sim@hostway.ca>
Signed-off-by: Josef Bacik <josef@redhat.com>