old child_sa gets deleted after rekeying

rekeying almost complete, but:
	IKE_SA get in an invalid state when both initiate rekeying at the same time,

src/charon/sa/states/create_child_sa_requested.h

@@ -47,13 +47,18 @@ struct create_child_sa_requested_t {
 /**
  * @brief Constructor of class create_child_sa_requested_t
  * 
+ * If this CREATE_CHILD_SA message is to rekey a CHILD_SA, 
+ * the child_sa with the specified reqid gets deleted after a new
+ * one is set up.
+ * 
  * @param ike_sa 	assigned ike_sa
  * @param child_sa	newly created child sa to complete
  * @param nonce		nonce sent at initialization
+ * @param reqid		reqid, when rekeying a child SA.
  * @return			created create_child_sa_requested_t object
  * 
  * @ingroup states
  */
-create_child_sa_requested_t *create_child_sa_requested_create(protected_ike_sa_t *ike_sa, child_sa_t *child_sa, chunk_t nonce_i);
+create_child_sa_requested_t *create_child_sa_requested_create(protected_ike_sa_t *ike_sa, child_sa_t *child_sa, chunk_t nonce_i, u_int32_t reqid);
 
 #endif /*CREATE_CHILD_SA_REQEUSTED_H_*/