From 4fed655c410cc56add64c7b1f7c85c7c56066ac2 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Wed, 8 Oct 2014 10:42:57 -0700
Subject: [PATCH] mnt: Clear mnt_expire during pivot_root

When inspecting the pivot_root and the current mount expiry logic I
realized that pivot_root fails to clear like mount move does.

Add the missing line in case someone does the interesting feat of
moving an expirable submount.  This gives a strong guarantee that root
of the filesystem tree will never expire.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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