Genesis Portfolio Image Without Permalink

/**
 * Adds Featured Image and links it to the Post
 *
 * @author Wes Straham
 * @since 1.0.0
 */
add_action( 'genesis_before_post_content', 'epik_portfolio_do_post_image' ); 
	function epik_portfolio_do_post_image() { 
		$img = genesis_get_image( array( 
		'format' => 'html', 
		'size' => 'portfolio-thumbnail', 
		'attr' => array( 
			'class' => 'alignnone post-image'
			 ) ) );
			 printf( $img );
	}