Ensure show_admin_bar( false ) works after init. Fixes #15856.

git-svn-id: https://develop.svn.wordpress.org/trunk@17021 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/functions.php

@@ -4484,6 +4484,11 @@ function wp_find_hierarchy_loop_tortoise_hare( $callback, $start, $override = ar
 function show_admin_bar( $show ) {
 	global $show_admin_bar;
 	$show_admin_bar = (bool) $show;
+	
+	// Remove the object if we are not going to be showing
+	// Otherwise you have to call this function prior to the init hook for it to work!
+	if ( ! $show_admin_bar && isset( $GLOBALS['wp_admin_bar'] ) )  	  	 
+		$GLOBALS['wp_admin_bar'] = null; 
 }
 
 ?>