p2p: do not close current connection if already ready

6f15399e broke the multi-transfer
with the same contact because it closes previous transfers. We need
to keep correct turn connections.

Change-Id: I0cb9942417b10cc1aaa7d6879613c685dc5de2ad
Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>

src/ringdht/p2p.cpp

@@ -425,11 +425,16 @@ DhtPeerConnector::Impl::turnConnect()
     if (turnAuthv6_ && !turnAuthv6_->isReady())
         turnAuthv6_.release();
 
+    if (!turnAuthv4_ || !turnAuthv4_->isReady()) {
         turn_param_v4.authorized_family = PJ_AF_INET;
         turnAuthv4_ = std::make_unique<TurnTransport>(turn_param_v4);
+    }
+
+    if (!turnAuthv6_ || !turnAuthv6_->isReady()) {
         auto turn_param_v6 = turn_param_v4;
         turn_param_v6.authorized_family = PJ_AF_INET6;
         turnAuthv6_ = std::make_unique<TurnTransport>(turn_param_v6);
+    }
 
     // Wait until TURN server READY state (or timeout)
     Timeout<Clock> timeout {NET_CONNECTION_TIMEOUT};