krogsgard/get-cat-link.php

## get-cat-link.php
<?php

$category = get_the_category();

if( $category[0] ){
	echo '<a href="' . get_category_link( $category[0]->term_id ) . '">' . __( 'View All Posts', 'justins-textdomain' ) . '</a>';
}
	<?php

	$category = get_the_category();

	if( $category[0] ){
	echo '<a href="' . get_category_link( $category[0]->term_id ) . '">' . __( 'View All Posts', 'justins-textdomain' ) . '</a>';
	}