NFSv4.1: Simplify struct nfs4_sequence_args too

Replace the session pointer + slotid with a pointer to the
allocated slot.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 9c9b76c..deb31bb 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -194,8 +194,7 @@
 };
 
 struct nfs4_sequence_args {
-	struct nfs4_session	*sa_session;
-	u32			sa_slotid;
+	struct nfs4_slot	*sa_slot;
 	u8			sa_cache_this;
 };