qemuMigrationSrcConfirm: Don't remove domain config if confirm phase fails

If migration is cancelled or confirm phase fails the domain
should be kept on the source even if VIR_MIGRATE_UNDEFINE_SOURCE
was requested.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_migration.c

@@ -3044,7 +3044,7 @@ qemuMigrationSrcConfirm(virQEMUDriverPtr driver,
 
     qemuMigrationJobFinish(driver, vm);
     if (!virDomainObjIsActive(vm)) {
-        if (flags & VIR_MIGRATE_UNDEFINE_SOURCE) {
+        if (!cancelled && ret == 0 && flags & VIR_MIGRATE_UNDEFINE_SOURCE) {
             virDomainDeleteConfig(cfg->configDir, cfg->autostartDir, vm);
             vm->persistent = 0;
         }