Fix of previous push.

sql/sql_table.cc:
  stupid me. error already exists in the function. Using a local 'int error' resulted in global 'error' not being inited, which probably made next steps (those testing global error) go wrong!

sql/sql_table.cc

@@ -1938,7 +1938,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
   {
     /* We don't log the statement, it will be logged later. */
     tmp_disable_binlog(thd);
-    int error= mysql_create_table(thd, new_db, tmp_name,
+    error= mysql_create_table(thd, new_db, tmp_name,
                               create_info,create_list,key_list,1);
     reenable_binlog(thd);
     if (error)