Fix final warnings produced by -Wshadow=compatible-local

David Rowley <drowley@postgresql.org>

Commit: cd4e8caaa0eb5c3d3b12a45b29035e7a4bdfa4a8
Author: David Rowley <drowley@postgresql.org>
Date: 2022-10-07T00:13:27Z
Releases: 16.0
Fix final warnings produced by -Wshadow=compatible-local

I thought I had these in d8df67bb1, but per report from Andres Freund, I
missed some.

Reviewed-by: Andres Freund
Discussion: https://postgr.es/m/20221005214052.c4tkudawyp5wxt3c@awork3.anarazel.de

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