Added status code to status_t

New status_t enum to allow packets to be sent to peer in task_manager->process

src/libstrongswan/utils.h

@@ -299,6 +299,11 @@ enum status_t {
 	 * Another call to the method is required.
 	 */
 	NEED_MORE,
+
+	/**
+	 * Call failed, send error to other side.
+	 */
+	FAILED_SEND_ERROR,
 };
 
 /**