--- a/tunnelbridge_cmd.c	Thu Mar 03 23:26:35 2005 +0000
+++ b/tunnelbridge_cmd.c	Fri Mar 04 00:14:28 2005 +0000
@@ -609,7 +609,8 @@
 		return (uint)-1;
 	}
 
-	if (length) *length = len;
+	if (length != NULL)
+		*length = len;
 	return tile;
 }