[Nice] Patch for TURN CreatePermission

[Madaro Livio]

Hi, I found a problem using TURN.
Libnice sends a TURN message CreatePermission Request for each remote candidate added by nice_agent_set_remote_candidates. The TURN server replies with a CreatePermission Response and libnice matches the Request and the Response using the message id. The problem is that libnice uses a single variable to store the sent messages (current_create_permission_msg). If a new CreatePermission Request is sent before receiving the Response of the previous one, the variable current_create_permission_msg is overwritten and the Response of the first message will never match the Request.

I send a patch for review. It adds a GList variable (pending_create_permission_messages ) to store all the CreatePermission Request waiting for a Response.

Regards,
Livio

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