make ngx_pool clear2

[Maxim Dounin]

Hello!

On Tue, Jun 04, 2019 at 04:38:21PM +0800, liuyujun wrote:

> hello. everybody here?
> 
> example before:
>     for (p = pool; p; p = p->d.next) {
>         p->d.last = (u_char *) p + sizeof(ngx_pool_t);
>         p->d.failed = 0;
>     }
> 
> 
> 
> 
> after:
>     for (p = &pool->d; p; p = p->next) {
>         if (p == &pool->d) {
>             p->last = (u_char *) p + sizeof(ngx_pool_t);
>         } else {
>             p->last = (u_char *) p + sizeof(ngx_pool_data_t);
>         }
>         p->failed = 0;
>     }

https://trac.nginx.org/nginx/ticket/1594

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-- 
Maxim Dounin
http://mdounin.ru/