From de4aee2e0a376fb272f44139150115a6dec1da95 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@redhat.com>
Date: Tue, 25 Feb 2014 17:21:08 -0500
Subject: [PATCH] rpc: Allow xdr_buf_subsegment to operate in-place

Allow

	xdr_buf_subsegment(&buf, &buf, base, len)

to modify an xdr_buf in-place.

Also, none of the callers need the iov_base of head or tail to be zeroed
out.

Also add documentation.

(As it turns out, I'm not really using this new guarantee, but it seems
a simple way to make this function a bit more robust.)

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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