Fix GiST's killing tuple: GISTScanOpaque->curpos wasn't

Teodor Sigaev <teodor@sigaev.ru>

Commit: 666aad267b6a5abdf808524f563189cef0d9e90e
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2008-10-22T12:54:25Z
Releases: 8.3.5
Fix GiST's killing tuple: GISTScanOpaque->curpos wasn't
correctly set. As result, killtuple() marks as dead
wrong tuple on page. Bug was introduced by me while fixing
possible duplicates during GiST index scan.

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