Add @static* annotations where they are missing.

Initialize all static vars that are not, most to `null`.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32650 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/http.php

@@ -22,11 +22,11 @@
  * @return WP_Http HTTP Transport object.
  */
 function _wp_http_get_object() {
-	static $http;
+	static $http = null;
 
-	if ( is_null($http) )
+	if ( is_null( $http ) ) {
 		$http = new WP_Http();
-
+	}
 	return $http;
 }