A custom footer snippet and accompanying .js that is intermittent - PhpStorm indicates issues but I haven't been able to resolve them

custom-footer.php

// Footer Copyright notice
add_filter('genesis_footer_output', 'my_footer_output_filter', 10, 3);
function my_footer_output_filter() {

	echo '<div class="footer-menu">';
	echo wp_nav_menu( array('menu' => 'Footer Nav') );
	echo '</div>';
	echo '<a href="#" rel="nofollow" class="gototop"><i class="arrow-up"></i></a>';

	$creds = '<p>Copyright &copy;2014&ndash;' . date('Y'). ' - <a href="' . trailingslashit( get_bloginfo('url') ) . '" title="' . esc_attr( get_bloginfo('name') ) . '" rel="nofollow">Site Name</a><br />Powered by <a href="http://www.wordpress.org" target="_blank">WordPress</a>. Theme by <a href="#" target="_blank">Site Owner</a>';

	$output = '<div class="creds">' . $creds . '</div></div>';

	return $output;

}

//* Add smooth scrolling for any link having the class of "top"
add_action('wp_footer', 'my_go_to_top');
function my_go_to_top() { ?>
	<script type="text/javascript">
		jQuery(function($) {
			$('a.gototop').click(function() {
				$('html, body').animate({scrollTop:0}, 'slow');
				return false;
			});
		});
	</script>
<?php }