WordPress Login Logo swap for Genesis Child Theme. Edit image filename and add to functions.php

gistfile1.txt

function rgt_custom_dashboard_logo(){
echo '<style  type="text/css">
h1 a {
background-image:url('.get_stylesheet_directory_uri().'/images/put-your-logo-filename-here.gif)  !important;
}
</style>';
}
add_action('login_head',  'rgt_custom_dashboard_logo');