Fix iterator in killscript_handler()

src/sbbs3/jsdebug.c

@@ -122,7 +122,7 @@ static void killscript_handler(JSContext *cx, JSScript *script, void *callerdata
 
 	if(dbg==NULL)
 		return;
-	for(node=listFirstNode(&scripts); node; node==NULL?listFirstNode(&scripts):listNextNode(node)) {
+	for(node=listFirstNode(&scripts); node; node==NULL?(node=listFirstNode(&scripts)):(node=listNextNode(node))) {
 		cs=(struct cur_script *)node->data;
 
 		if(cs->script == script) {