db_query_range not being properly called in install_menu_get_item

in core/menu.inc, install_menu_get_item() is calling db_query_range as follows:

return db_fetch_array(db_query_range("SELECT * FROM {menu_links} WHERE mlid = %d", $mlid));

This has no $count or $from parameters causing the function to return NULL. The attached patch fixes this.