pk: Don't set damaged flag if validate mode hits a transient error
pk: Don't set damaged flag if validate mode hits a transient error

- Validate mode: don't set the damaged flag in case of I/O error, malloc
error, etc.; only set it if there's a genuine problem

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr