More cleanup possibilities

* procfs.c, procfs.h: Extend the signature of the
  cleanup_contents callback in the procfs_node_ops structure to include
  the hook and contents_len.  (cleanup_contents_with_free,
  cleanup_contents_with_vm_deallocate): New functions, can be used as
  a cleanup_contents callback for simple cases.
* procfs_dir.c, procfs_dir.h (procfs_dir_make_node):
  Update, add a cleanup callback, make sure the cleanup callback is
  invoked if there is an error.
* proclist.c (proclist_make_node), main.c (main): Update to match
  the new interfaces.

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