small bug fix in max queries per hour

sql/sql_class.cc

@@ -136,12 +136,12 @@ THD::THD():user_time(0),fatal_error(0),last_insert_id_used(0),
 
   /* Initialize sub structures */
   bzero((char*) &mem_root,sizeof(mem_root));
+  user_connect=(UC *)0;
   hash_init(&user_vars, USER_VARS_HASH_SIZE, 0, 0,
 	    (hash_get_key) get_var_key,
 	    (void (*)(void*)) free_var,0);
 #ifdef USING_TRANSACTIONS
   bzero((char*) &transaction,sizeof(transaction));
-  user_connect=(UC *)0;
   if (opt_using_transactions)
   {
     if (open_cached_file(&transaction.trans_log,