Test NDEFENSIVE_CHECKS instead of DEFENSIVE_CHECKS.

Test NDEBUG instead of DEBUG.

src/server/internal-connections.c

 /*
- * $Id: internal-connections.c,v 0.19 1994/04/05 08:01:15 ceder Exp $
+ * $Id: internal-connections.c,v 0.20 1994/06/18 20:25:08 ceder Exp $
  * Copyright (C) 1991, 1992, 1993, 1994  Lysator Academic Computer Association.
  *
  * This file is part of the LysKOM server.
@@ -28,7 +28,7 @@
  * Abstract routines on the data type Connection.
  */
 
-static char *rcsid = "$Id: internal-connections.c,v 0.19 1994/04/05 08:01:15 ceder Exp $";
+static char *rcsid = "$Id: internal-connections.c,v 0.20 1994/06/18 20:25:08 ceder Exp $";
 #include "rcs.h"
 USE(rcsid);
 
@@ -229,7 +229,7 @@ kill_client(Connection *cp)
     --no_of_allocated_connections;
 }
 
-#ifdef DEFENSIVE_CHECKS
+#ifndef NDEFENSIVE_CHECKS
 
 INTERNAL  void
 check_conn_exists(Connection *foo)
@@ -273,7 +273,7 @@ get_conn_by_number (Session_no session_no)
 		    last_conn->session_no,
 		    "and all_connections == NULL");
     }
-#ifdef DEFENSIVE_CHECKS
+#ifndef NDEFENSIVE_CHECKS
     else
 	check_conn_exists(last_conn);
 #endif