[menu] Truncate menu title when necessary

Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/tui/menu_ui.c

 		const char *select, struct menu_item **selected ) {
 	struct menu_item *item;
 	struct menu_ui ui;
+	char buf[ MENU_COLS + 1 /* NUL */ ];
 	int labelled_count = 0;
 	int rc;
 
 
 	/* Draw initial content */
 	attron ( A_BOLD );
-	mvprintw ( TITLE_ROW, ( ( COLS - strlen ( ui.menu->title ) ) / 2 ),
-		   "%s", ui.menu->title );
+	snprintf ( buf, sizeof ( buf ), "%s", ui.menu->title );
+	mvprintw ( TITLE_ROW, ( ( COLS - strlen ( buf ) ) / 2 ), "%s", buf );
 	attroff ( A_BOLD );
 	draw_menu_items ( &ui );
 	draw_menu_item ( &ui, ui.selected );