Remove logo img not hiding it

Hi ,
i want remove the logo image tag. All the solutions i found are to set display:none, but that is not removuing the tag, just hiding it.
in my functions.php (child-theme) is use this to add additional Text to the logo/link:

add_filter('avf_logo', 'kriesi_logo_addition');
function kriesi_logo_addition($logo) {
	$logo .= "<h1>zum Stinesler</h1>";
	$logo .= "<br><h2>";
	$logo .= get_bloginfo( 'description', 'display' );
	$logo .= "</h2>";
	return $logo;
}

No i want to remove the logo image html tag . how do i do that?