NFSv4: Clean up nfs_expire_all_delegations()

Let the actual delegreturn stuff be run in the state manager thread rather
than allocating a separate kthread.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 6dc36a0..cd16b30 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -781,7 +781,7 @@
 /*
  * Schedule the nfs_client asynchronous state management routine
  */
-static void nfs4_schedule_state_manager(struct nfs_client *clp)
+void nfs4_schedule_state_manager(struct nfs_client *clp)
 {
 	struct task_struct *task;