Upstream: r->upstream->length type change to off_t. Previous use of size_t may cause wierd effects on 32bit platforms with certain big responses transferred in unbuffered mode. Nuke "if (size > u->length)" check as it's not usefull anyway (preread body data isn't subject to this check) and now requires additional check for u->length being positive.

// Copyright (C) Igor Sysoev


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