xen/domain: fix memory leak in domain_create()

Fix potential memory leak in domain_create() in late hardware domain case.

Fixes: b959f3b820 ("xen: introduce hardware domain create flag")
Signed-off-by: Denis Mukhin <dmukhin@ford.com>

xen/common/domain.c

@@ -825,7 +825,10 @@ struct domain *domain_create(domid_t domid,
 
         /* late_hwdom is only allowed for dom0. */
         if ( hardware_domain && hardware_domain->domain_id )
+        {
+            free_domain_struct(d);
             return ERR_PTR(-EINVAL);
+        }
 
         old_hwdom = hardware_domain;
         hardware_domain = d;