Merge bk-internal.mysql.com:/home/bk/mysql-4.1

into  zippy.(none):/home/cmiller/work/mysql/m41-maint--07AB5

sql/item_func.h

@@ -138,7 +138,10 @@ public:
   {
     return (null_value=args[0]->get_time(ltime));
   }
-  bool is_null() { (void) val_int(); return null_value; }
+  bool is_null() { 
+    (void) val_int();  /* Discard result. It sets null_value as side-effect. */ 
+    return null_value; 
+  }
   friend class udf_handler;
   Field *tmp_table_field() { return result_field; }
   Field *tmp_table_field(TABLE *t_arg);

sql/sql_base.cc

@@ -499,8 +499,10 @@ void close_temporary_tables(THD *thd)
 
   if (!mysql_bin_log.is_open())
   {
-    for (table= thd->temporary_tables; table; table= table->next)
+    TABLE *next;
+    for (table= thd->temporary_tables; table; table= next)
     {
+      next= table->next;
       close_temporary(table, 1);
     }
     thd->temporary_tables= 0;