Backport of:

 2630.16.14 Sergei Golubchik	2008-08-25
 fixed a crash in partition tests
 introduced by HA_EXTRA_PREPARE_FOR_DROP patch


sql/sql_base.cc:
  Don't call ::extra() for closed tables.

sql/sql_base.cc

@@ -1318,6 +1318,10 @@ close_all_tables_for_name(THD *thd, TABLE_SHARE *share,
     if (table->s->table_cache_key.length == key_length &&
         !memcmp(table->s->table_cache_key.str, key, key_length))
     {
+      /* Inform handler that table will be dropped after close */
+      if (table->db_stat)
+        table->file->extra(HA_EXTRA_PREPARE_FOR_DROP);
+
       /*
         Does nothing if the table is not locked.
         This allows one to use this function after a table