functions.php

<?php

/**
 * Enqueue Inline Styles
 *
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/enqueue-inline-styles/
 */
function be_enqueue_inline_styles() {
	$css = '';
	$logo = get_option( 'options_be_site_logo' );
	if( $logo ) {
		$logo = wp_get_attachment_image_src( $logo, 'full' );
		$css .= '
			.site-title { background-image: url(' . $logo[0] . ');}
		';
	}
	if( !empty( $css ) )
		wp_add_inline_style( 'child-theme', $css );
}
add_action( 'wp_enqueue_scripts', 'be_enqueue_inline_styles' );