[Nice] patch for TURN nonce expired

[Madaro Livio]

Hi,
I think there is a problem when  TURN nonce expires.
If the nonce expires the TURN server replies with error code 438 when libnice sends a TURN allocation refresh.  libnice should re-send the allocation refresh with the new nonce but libnice fails to validate the error code 438 (STUN_VALIDATION_UNAUTHORIZED).
Using turnserver.org the nonce expires after 1 hour.

I send a patch for review. I just added a check for error code 438 in stun validation (stun_agent_validate). Do you think the check for error 438 is missing elsewhere?

Regards,
Livio

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