Fixed a build failure in mysql-trunk-merge caused by a bad

merge from mysql-5.1-bugteam.

sql/sp_head.cc

@@ -2811,9 +2811,9 @@ sp_lex_keeper::reset_lex_and_exec_core(THD *thd, uint *nextp,
     open_tables stage.
   */
   if (!res || !thd->is_error() ||
-      (thd->main_da.sql_errno() != ER_CANT_REOPEN_TABLE &&
-       thd->main_da.sql_errno() != ER_NO_SUCH_TABLE &&
-       thd->main_da.sql_errno() != ER_UPDATE_TABLE_USED))
+      (thd->stmt_da->sql_errno() != ER_CANT_REOPEN_TABLE &&
+       thd->stmt_da->sql_errno() != ER_NO_SUCH_TABLE &&
+       thd->stmt_da->sql_errno() != ER_UPDATE_TABLE_USED))
     thd->stmt_arena->state= Query_arena::EXECUTED;
 
   /*