Fix leak of virNetworkPtr in LXC startup failure path

When starting an LXC guest with a virNetwork based NIC device,
if the network was not active, the virNetworkPtr device would
be leaked
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 509ce943)

src/lxc/lxc_process.c

@@ -468,7 +468,6 @@ static int virLXCProcessSetupInterfaces(virConnectPtr conn,
                     virReportError(VIR_ERR_INTERNAL_ERROR,
                                    _("Network '%s' is not active."),
                                    def->nets[i]->data.network.name);
-                goto cleanup;
             }
 
             if (!fail) {