wp_loginout() in footer

Hello,

I’d like to add the wp_loginout() function to the footer.
I created a function in functions.php.

But the wp_loginout() won’t be in the <p> function of the sprint().

Whats wrong with that?
Here is my custom function from the functions.php

add_filter( 'tc_credits_display', 'my_credits_display' );
function my_credits_display($html) {
    ?>
    <div class="span4 credits">
        <?php
            $credits =  sprintf( '<p> · © %1$s <a href="%2$s" title="%3$s" rel="bookmark">%3$s</a> · %4$s ·</p>',
                    esc_attr( date( 'Y' ) ),
                    esc_url( home_url() ),
                    esc_attr(get_bloginfo()),
					'<a href="'.TC_WEBSITE.'">Themes & Co.</a>'
            );
            echo $credits;
	    $anmelden =  sprintf( '<p> · %1$s · </p>',esc_url(wp_loginout()));
	    echo $anmelden;
        ?>
    </div>
    <?php
}