Remove the link to the single post from the post image

gistfile1.txt

if ( ! function_exists( 'generate_post_image' ) ) :
/**
 * Prints the Post Image to post excerpts
 */
add_action( 'generate_after_entry_header', 'generate_post_image' );
function generate_post_image()
{
		
	// If there's no featured image, return
	if ( ! has_post_thumbnail() )
		return;
		
	// If we're not on any single post/page or the 404 template, we must be showing excerpts
	if ( ! is_singular() && ! is_404() ) {
	?>
		<div class="post-image">
			<?php the_post_thumbnail( apply_filters( 'generate_page_header_default_size', 'full' ), array('itemprop' => 'image') ); ?>
		</div>
	<?php
	}
}
endif;