Remove meaningless assignments in nbtree code

Bruce Momjian <bruce@momjian.us>

Commit: 05684c8255af57258386c00354c61155ec519707
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-12-19T15:33:48Z
Releases: 13.0
Remove meaningless assignments in nbtree code

Reported-by: Ranier Vilela

Discussion: https://postgr.es/m/MN2PR18MB2927BB876D12A70FDBE8F35AE3450@MN2PR18MB2927.namprd18.prod.outlook.com

Backpatch-through: master

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