udp: Fix local_port management
The default value for unset is -1, not 0.
Problem introduced in 66028b7ba6
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8655c54160
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61dc9d647c
@ -519,7 +519,7 @@ static int udp_open(URLContext *h, const char *uri, int flags)
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goto fail;
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}
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if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
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if ((s->is_multicast || s->local_port < 0) && (h->flags & AVIO_FLAG_READ))
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s->local_port = port;
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if (localaddr[0])
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