Core: improved ngx_reset_pool() (ticket #490). Previously pool->current wasn't moved back to pool, resulting in blocks not used for further allocations if pool->current was already moved at the time of ngx_reset_pool(). Additionally, to preserve logic of moving pool->current, the p->d.failed counters are now properly cleared. While here, pool->chain is also cleared. This change is essentially a nop with current code, but generally improves things.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


ngx_include="unistd.h";      . auto/include
ngx_include="inttypes.h";    . auto/include
ngx_include="limits.h";      . auto/include
ngx_include="sys/filio.h";   . auto/include
ngx_include="sys/param.h";   . auto/include
ngx_include="sys/mount.h";   . auto/include
ngx_include="sys/statvfs.h"; . auto/include
ngx_include="crypt.h";       . auto/include