Consistent reset of resource holders on doBegin failure

Issue: SPR-12280

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateTransactionManager.java

@@ -513,6 +513,7 @@ public class HibernateTransactionManager extends AbstractPlatformTransactionMana
 				}
 				finally {
 					SessionFactoryUtils.closeSession(session);
+					txObject.setSessionHolder(null);
 				}
 			}
 			throw new CannotCreateTransactionException("Could not open Hibernate Session for transaction", ex);