Post-merge fix.

sql/sql_parse.cc:
  Post-merge fix.  No need to check DB name twice.

sql/sql_parse.cc

@@ -6385,7 +6385,9 @@ TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
     my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
     DBUG_RETURN(0);
   }
-  if (table->db.str && check_db_name(table->db.str))
+
+  if (table->is_derived_table() == FALSE && table->db.str &&
+      check_db_name(table->db.str))
   {
     my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
     DBUG_RETURN(0);
@@ -6406,11 +6408,6 @@ TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
     DBUG_RETURN(0);				/* purecov: inspected */
   if (table->db.str)
   {
-    if (table->is_derived_table() == FALSE && check_db_name(table->db.str))
-    {
-      my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
-      DBUG_RETURN(0);
-    }
     ptr->db= table->db.str;
     ptr->db_length= table->db.length;
   }