Fix crashing upgrading from older libvirts with running guests

If upgrading from a libvirt that is older than 1.0.5, we can
not assume that vm->def->resource is non-NULL. This bogus
assumption caused libvirtd to crash
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/lxc/lxc_process.c

@@ -1204,7 +1204,9 @@ int virLXCProcessStart(virConnectPtr conn,
     }
 
     if (virCgroupNewDetectMachine(vm->def->name, "lxc", vm->pid,
-                                  vm->def->resource->partition,
+                                  vm->def->resource ?
+                                  vm->def->resource->partition :
+                                  NULL,
                                   -1, &priv->cgroup) < 0)
         goto error;
 
@@ -1413,7 +1415,9 @@ virLXCProcessReconnectDomain(virDomainObjPtr vm,
             goto error;
 
         if (virCgroupNewDetectMachine(vm->def->name, "lxc", vm->pid,
-                                      vm->def->resource->partition,
+                                      vm->def->resource ?
+                                      vm->def->resource->partition :
+                                      NULL,
                                       -1, &priv->cgroup) < 0)
             goto error;
 

src/qemu/qemu_cgroup.c

@@ -707,7 +707,9 @@ qemuConnectCgroup(virQEMUDriverPtr driver,
     if (virCgroupNewDetectMachine(vm->def->name,
                                   "qemu",
                                   vm->pid,
-                                  vm->def->resource->partition,
+                                  vm->def->resource ?
+                                  vm->def->resource->partition :
+                                  NULL,
                                   cfg->cgroupControllers,
                                   &priv->cgroup) < 0)
         goto cleanup;