Hi There,
Please copy this file from the parent theme: x/framework/legacy/cranium/headers/views/global/_brand.php
To child theme: x-child/framework/legacy/cranium/headers/views/global/_brand.php
After that change the source code of that file to:
<?php
// =============================================================================
// VIEWS/GLOBAL/_BRAND.PHP
// -----------------------------------------------------------------------------
// Outputs the brand.
// =============================================================================
$site_name = get_bloginfo( 'name' );
$site_description = get_bloginfo( 'description' );
$logo = x_make_protocol_relative( x_get_option( 'x_logo' ) );
$site_logo = '<img src="' . $logo . '" alt="' . $site_description . '">';
?>
<a href="<?php echo home_url( '/' ); ?>" class="<?php x_brand_class(); ?>" title="<?php echo $site_description; ?>">
<?php echo ( $logo == '' ) ? $site_name : $site_logo; ?>
</a>