Something like this should work for your single.php template:
<?php
$next_post = get_adjacent_post( false,'',false );
if( isset($next_post->ID) ):
$next_id = $next_post->ID;
else:
$next_post = new WP_Query( 'posts_per_page=1&post_type=photo&order=ASC' );
$next_id = $next_post->post->ID;
endif;
?>
<a href="https://wordpress.stackexchange.com/questions/27977/<?php echo get_permalink( $next_id ); ?>">
<?php echo get_the_post_thumbnail( $next_id, 'thumbnail' ); ?>
</a>
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