qemuDomainAttachNetDevice: Clean up unneeded 'slirp' helper variables

We don't need 'slirpfdName' and 'slirpfd'. The 'slirp' local can be
removed too as qemuSlirpStart is safe to be called if there's nothing to
do.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_hotplug.c

@@ -1183,8 +1183,6 @@ qemuDomainAttachNetDevice(virQEMUDriver *driver,
     virDomainDeviceDef dev = { VIR_DOMAIN_DEVICE_NET, { .net = net } };
     qemuDomainNetworkPrivate *netpriv = QEMU_DOMAIN_NETWORK_PRIVATE(net);
     virErrorPtr originalError = NULL;
-    g_autofree char *slirpfdName = NULL;
-    int slirpfd = -1;
     g_autoptr(virJSONValue) nicprops = NULL;
     g_autoptr(virJSONValue) netprops = NULL;
     int ret = -1;
@@ -1305,14 +1303,10 @@ qemuDomainAttachNetDevice(virQEMUDriver *driver,
     case VIR_DOMAIN_NET_TYPE_USER:
         if (!priv->disableSlirp &&
             virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DBUS_VMSTATE)) {
-            qemuSlirp *slirp = NULL;
 
             if (qemuInterfacePrepareSlirp(driver, net) < 0)
                 goto cleanup;
 
-            if (!(slirp = QEMU_DOMAIN_NETWORK_PRIVATE(net)->slirp))
-                break;
-
             if (qemuSlirpStart(vm, net, NULL) < 0) {
                 virReportError(VIR_ERR_INTERNAL_ERROR,
                                "%s", _("Failed to start slirp"));
@@ -1408,7 +1402,7 @@ qemuDomainAttachNetDevice(virQEMUDriver *driver,
     }
 
     if (qemuMonitorAddNetdev(priv->mon, &netprops,
-                             slirpfd, slirpfdName) < 0) {
+                             -1, NULL) < 0) {
         qemuDomainObjExitMonitor(vm);
         virDomainAuditNet(vm, NULL, net, "attach", false);
         goto try_remove;
@@ -1511,7 +1505,6 @@ qemuDomainAttachNetDevice(virQEMUDriver *driver,
     }
 
     virDomainCCWAddressSetFree(ccwaddrs);
-    VIR_FORCE_CLOSE(slirpfd);
 
     return ret;