userns: Rename id_map_mutex to userns_state_mutex
Generalize id_map_mutex so it can be used for more state of a user namespace. Cc: stable@vger.kernel.org Reviewed-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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