revert: Remove meaningless assignments in nbtree code

Bruce Momjian <bruce@momjian.us>

Commit: b93e9a5c94b4c89932a637798bd560971fe790d7
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-12-19T16:19:10Z
Releases: 13.0
revert:  Remove meaningless assignments in nbtree code

Reverts commit 05684c8255.

Reported-by: Tom Lane

Discussion: https://postgr.es/m/404.1576770942@sss.pgh.pa.us

Backpatch-through: master

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