WP Theme issue

add_action( 'customize_register', 'themename_customize_register' );

function themename_customize_register($wp_customize) {

// add new section
$wp_customize->add_section( 'bwpy_theme_colors', array(
	'title' => __( 'Theme Colors', 'bwpy' ),
	'priority' => 100,
) );

// add color picker setting
$wp_customize->add_setting( 'link_color', array(
	'default' => '#ff0000'
) );

// add color picker control
$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'link_color', array(
	'label' => 'Link Color',
	'section' => 'bwpy_theme_colors',
	'settings' => 'link_color',
) ) );


function bwpy_customizer_head_styles() {
	$link_color = get_theme_mod( 'link_color' ); 
	
	if ( $link_color != '#ffffff' ) : ?>
		<style type="text/css">
			.header_bg_color {
				background-color: <?php echo $link_color; ?>;
			}
		</style>
	<?php endif; }

add_action( 'wp_head', 'bwpy_customizer_head_styles' );

}