Constlen can be -1, so make it a signed type.

Bruce Momjian <bruce@momjian.us>

Commit: 856da1e65a9e7d6381771d31f54fe9ee8c021592
Author: Bruce Momjian <bruce@momjian.us>
Date: 1998-02-21T16:58:49Z
Releases: 7.1.1
Constlen can be -1, so make it a signed type.

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