From 4b8164b91d9fdff4dbac0a742d076bdff7fda21b Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 31 Jan 2015 20:08:47 -0500
Subject: [PATCH] new helper: dup_iter()

Copy iter and kmemdup the underlying array for the copy.  Returns
a pointer to result of kmemdup() to be kfree()'d later.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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