Free a context.
If stop has not been called prior to this function, free can block until all io operations has finished.
NABTO_CLIENT_DECL_PREFIX NabtoClientError NABTO_CLIENT_API nabto_client_free2(NabtoClient* context)
- [in] The context
NABTO_CLIENT_EC_OK: iff the context is freed
NABTO_CLIENT_EC_COULD_BLOCK: if the free is called from a callback.