msc: Only unregister the fd if the fd value is valid.
This makes sure that someone can call bsc_msc_lost multiple times even if there is no MSC connection. This makes sense as bsc_msc_lost is public and be called from client code.
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@ -216,7 +216,9 @@ void bsc_msc_lost(struct bsc_msc_connection *con)
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{
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write_queue_clear(&con->write_queue);
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bsc_del_timer(&con->timeout_timer);
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bsc_unregister_fd(&con->write_queue.bfd);
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if (con->write_queue.bfd.fd >= 0)
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bsc_unregister_fd(&con->write_queue.bfd);
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connection_loss(con);
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}
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