Patch Services_JSON to use the proper function name and avoid a fatal error. see #24210.

git-svn-id: http://core.svn.wordpress.org/trunk@24587 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-json.php

@@ -492,7 +492,7 @@ class Services_JSON
                         
                         return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
                         ? 'null'
-                        : new Services_JSON_Error(class_name($var).
+                        : new Services_JSON_Error(get_class($var).
                             " toJSON returned an object with a toJSON method.");
                             
                     }
@@ -933,4 +933,4 @@ if (class_exists('PEAR_Error')) {
     
 }
 
-endif;
+endif;