void astman_send_error(struct mansession *s, const struct message *m, char *error);
/*! \brief Send error in manager transaction (with va_args support) */
-void astman_send_error_va(struct mansession *s, const struct message *m, const char *fmt, ...);
+void __attribute__((format(printf, 3, 4))) astman_send_error_va(struct mansession *s, const struct message *m, const char *fmt, ...);
/*! \brief Send response in manager transaction */
void astman_send_response(struct mansession *s, const struct message *m, char *resp, char *msg);