pgsql: Silence _bt_check_unique compiler warning.

Silence _bt_check_unique compiler warning. Reported-By: Tom Lane Discussion: https://postgr.es/m/[email protected] Branch -- master Details --- https://git.postgresql.org/pg/commitdiff/d64f1cdf2f4bef1454c74af1028c9ea0c3280322 Modified Files -- src/backend/acces

pgsql: Silence _bt_check_unique compiler warning.

Silence _bt_check_unique compiler warning. Reported-By: Tom Lane Discussion: https://postgr.es/m/[email protected] Branch -- REL_13_STABLE Details --- https://git.postgresql.org/pg/commitdiff/e745bcc00149fe3c35ba1123800e0beb948e3678 Modified Files -- src/backen