pidns: Export free_pid_ns

There is a least one modular user so export free_pid_ns so modules can
capture and use the pid namespace on the very rare occasion when it
makes sense.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
1 file changed