Remove redundant _bt_killitems() buffer check.
_bt_getbuf() cannot return an invalid buffer.
Oversight in commit 2ed5b87f96
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@ -1756,10 +1756,6 @@ _bt_killitems(IndexScanDesc scan)
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/* Attempt to re-read the buffer, getting pin and lock. */
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buf = _bt_getbuf(scan->indexRelation, so->currPos.currPage, BT_READ);
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/* It might not exist anymore; in which case we can't hint it. */
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if (!BufferIsValid(buf))
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return;
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page = BufferGetPage(buf);
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if (BufferGetLSNAtomic(buf) == so->currPos.lsn)
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so->currPos.buf = buf;
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