Release cache tuple when no longer needed

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: ed0fbc8e5ac995eada933250c1d5535336442b97
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-04-13T16:19:38Z
Releases: 15.0
Release cache tuple when no longer needed

There was a small buglet in commit 52e4f0cd472d whereby a tuple acquired
from cache was not released, giving rise to WARNING messages; fix that.

While at it, restructure the code a bit on stylistic grounds.

Author: Hou zj <houzj.fnst@fujitsu.com>
Reported-by: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://postgr.es/m/CAHut+PvKTyhTBtYCQsP6Ph7=o-oWRSX+v+PXXLXp81-o2bazig@mail.gmail.com

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