Fix array subscript overruns identified by Yichen Xie.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: b8add56ed0910c3cb749ec2a6f2f7531a847132e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-01-29T01:01:05Z
Releases: 7.4.1
Fix array subscript overruns identified by Yichen Xie.

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