fs: don't forget to put old mntns in mntns_install
Fixes: 4f757f3c ("make sure that mntns_install() doesn't end up with referral for root") Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: NAndrei Vagin <avagin@openvz.org> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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