In case that you want to remove link in image too, you edit the file:
/modules/mod_jacontentlisting/tmpl/elements/media.php
Line 48:
<a href="<?php echo $item->link; ?>" title="<?php echo $item->title; ?>"><img src="<?php echo $img_intro; ?>" alt="<?php echo $item->title; ?>"></a>
change it to:
<img src="<?php echo $img_intro; ?>" alt="<?php echo $item->title; ?>">