Don't render the screen reader shortcut 'Log Out' link in the toolbar when the user is not logged in.

Merges [24442] to the 3.5 branch.

props SergeyBiryukov.
fixes #23178.



git-svn-id: http://core.svn.wordpress.org/branches/3.5@24443 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-admin-bar.php

@@ -354,7 +354,9 @@ class WP_Admin_Bar {
 					$this->_render_group( $group );
 				} ?>
 			</div>
+			<?php if ( is_user_logged_in() ) : ?>
 			<a class="screen-reader-shortcut" href="<?php echo esc_url( wp_logout_url() ); ?>"><?php _e('Log Out'); ?></a>
+			<?php endif; ?>
 		</div>
 
 		<?php