[libvirt] PATCH: Fix check for inactive network

["Daniel P. Berrange" <berrange redhat com>]

When building up the QEMU command line args we forgot to check for a NULL
when creating the TAP device arg. This can happen if the network being
connected to the VM is not running. This is something I broke in the
refactoring of the ARGV construction in the QEMU driver.

Dan.

Index: src/qemu_conf.c
===================================================================
RCS file: /data/cvs/libvirt/src/qemu_conf.c,v
retrieving revision 1.76
diff -u -p -r1.76 qemu_conf.c
--- src/qemu_conf.c	29 May 2008 19:20:23 -0000	1.76
+++ src/qemu_conf.c	6 Jun 2008 13:29:17 -0000
@@ -2679,8 +2679,13 @@ int qemudBuildCommandLine(virConnectPtr 
             switch (net->type) {
             case QEMUD_NET_NETWORK:
             case QEMUD_NET_BRIDGE:
-                ADD_ARG(qemudNetworkIfaceConnect(conn, driver, vm, net, vlan));
-                break;
+                {
+                    char *tap = qemudNetworkIfaceConnect(conn, driver, vm, net, vlan);
+                    if (tap == NULL)
+                        goto error;
+                    ADD_ARG(tap);
+                    break;
+                }
 
             case QEMUD_NET_ETHERNET:
                 {


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