Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFS: Ensure that rpc_release_resources_task() can be called twice.
  NFS: Don't leak RPC clients in NFSv4 secinfo negotiation
  NFS: Fix a hang in the writeback path