Remove no-op free functions from schema wrapper types.

These objects are owned by the parent xmlSchemaPtr and freed when the
schema is freed. The free functions were nulling a local variable then
calling xmlFree(NULL) — a no-op since their introduction in 2012.

Author: cfis

ext/libxml/ruby_xml_schema_attribute.c

@@ -50,16 +50,9 @@ struct _xmlSchemaAttributeUseProhib {
 
 VALUE cXMLSchemaAttribute;
 
-static void rxml_schema_attribute_free(void *data)
-{
-  xmlSchemaAttributeUsePtr attr = (xmlSchemaAttributeUsePtr)data;
-  attr = NULL;
-  xmlFree(attr);
-}
-
 static const rb_data_type_t rxml_schema_attribute_type = {
   "XML::Schema::Attribute",
-  {NULL, rxml_schema_attribute_free, NULL},
+  {NULL, NULL, NULL},
   NULL, NULL, 0
 };
 

ext/libxml/ruby_xml_schema_element.c

@@ -4,16 +4,9 @@
 
 VALUE cXMLSchemaElement;
 
-static void rxml_schema_element_free(void *data)
-{
-  xmlSchemaElementPtr xschema_element = (xmlSchemaElementPtr)data;
-  xschema_element = NULL;
-  xmlFree(xschema_element);
-}
-
 static const rb_data_type_t rxml_schema_element_type = {
   "XML::Schema::Element",
-  {NULL, rxml_schema_element_free, NULL},
+  {NULL, NULL, NULL},
   NULL, NULL, 0
 };
 

ext/libxml/ruby_xml_schema_facet.c

@@ -7,16 +7,9 @@
 
 VALUE cXMLSchemaFacet;
 
-static void rxml_schema_facet_free(void *data)
-{
-  xmlSchemaFacetPtr facet = (xmlSchemaFacetPtr)data;
-  facet = NULL;
-  xmlFree(facet);
-}
-
 static const rb_data_type_t rxml_schema_facet_type = {
   "XML::Schema::Facet",
-  {NULL, rxml_schema_facet_free, NULL},
+  {NULL, NULL, NULL},
   NULL, NULL, 0
 };
 

ext/libxml/ruby_xml_schema_type.c

@@ -46,16 +46,9 @@ a group definition, a XML_SCHEMA_EXTRA_QNAMEREF (if a reference),
 
 VALUE cXMLSchemaType;
 
-static void rxml_schema_type_free(void *data)
-{
-  xmlSchemaTypePtr xschema_type = (xmlSchemaTypePtr)data;
-  xschema_type = NULL;
-  xmlFree(xschema_type);
-}
-
 static const rb_data_type_t rxml_schema_type_type = {
   "XML::Schema::Type",
-  {NULL, rxml_schema_type_free, NULL},
+  {NULL, NULL, NULL},
   NULL, NULL, 0
 };