Define G_DEFINE_AUTOPTR_CLEANUP_FUNC for virDomainCheckpointDef

Allow g_autoptr to be used instead of VIR_AUTOUNREF.
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/conf/checkpoint_conf.h

@@ -57,6 +57,7 @@ struct _virDomainCheckpointDef {
     virDomainCheckpointDiskDef *disks;
 };
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(virDomainCheckpointDef, virObjectUnref);
 
 typedef enum {
     VIR_DOMAIN_CHECKPOINT_PARSE_REDEFINE = 1 << 0,