NFSv4.1: Add DESTROY_CLIENTID

Ensure that we destroy our lease on last unmount

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 54006a9..af2d2fa 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -608,6 +608,7 @@
 	NFSPROC4_CLNT_FREE_STATEID,
 	NFSPROC4_CLNT_GETDEVICELIST,
 	NFSPROC4_CLNT_BIND_CONN_TO_SESSION,
+	NFSPROC4_CLNT_DESTROY_CLIENTID,
 };
 
 /* nfs41 types */