ts_conf: Fix unbounded write by scanf()

Buffer write operations that do not control the length of data
written may overflow.

Also, the scanf format string "%[^\n]s" is ill-formed. It contains
two independent format specifiers: "%[^\n]" followed by a lone "s".
This will direct scanf to read everything until \n is encountered
(leaving \n unread), and then require that the next input character
is s. This just doesn't make any sense. No input will match such
self-contradictory format.
Reference: https://stackoverflow.com/questions/8177752/scanf-ns-a-vs-getsa

Author: szsam

tests/ts_conf.c

@@ -144,14 +144,14 @@ static int add_line_after(struct ts_module_conf *conf)
 		goto err;
 
 	printf("new module name without parameters: ");
-	ret = scanf("%s", new_filter->name);
+	ret = scanf("%1023s", new_filter->name);
 	if (ret <= 0) {
 		perror("scanf");
 		goto err;
 	}
 	printf("parameters: ");
 	while ((c = getchar()) != '\n' && c != EOF) { }
-	ret = scanf("%[^\n]s", new_filter->params);
+	ret = scanf("%1023[^\n]", new_filter->params);
 	if (ret < 0)
 		goto err;
 	new_filter->nr = ++nr;