chown_mapped_rootid: don't double-map root id
chown_mapped_rootid: don't double-map root id

If the user maps container root to his host uid, chown_mapped_rootid
tries to make the same mapping twice and gets -EINVAL.

Reported-by: Andy Whitcroft <b4658fdd7fbd645c2859b0e39d71018f32058d12@canonical.com>
Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

ojkastl/lxc_Patches,ojkastl/lxc_Patches,ojkastl/lxc_Patches,ojkastl/lxc_Patches