qemuDomainGetMachineName: Access embeddedRoot from driver rather than cfg

The cfg->root is going away, therefore get the info right from
the driver structure.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/qemu/qemu_domain.c

@@ -12980,7 +12980,6 @@ qemuDomainGetMachineName(virDomainObjPtr vm)
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;
     virQEMUDriverPtr driver = priv->driver;
-    g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
     char *ret = NULL;
 
     if (vm->pid > 0) {
@@ -12990,7 +12989,8 @@ qemuDomainGetMachineName(virDomainObjPtr vm)
     }
 
     if (!ret)
-        ret = virDomainDriverGenerateMachineName("qemu", cfg->root,
+        ret = virDomainDriverGenerateMachineName("qemu",
+                                                 driver->embeddedRoot,
                                                  vm->def->id, vm->def->name,
                                                  driver->privileged);