Fix compiler warning

With some newer gcc versions (8 and 9) you get a -Wformat-overflow
warning here.  In PG11 and later this was already fixed.  Since it's
trivial, backport it to get the older branches building without
warnings.

This back-patches commit 333a186dc into out-of-support branches,
pursuant to newly-established project policy.  The point is to
suppress scary-looking warnings so that people building these
branches needn't expend brain cells verifying that it's safe
to ignore the warnings.

Discussion: 
https://postgr.es/m/[email protected]

Branch
------
REL9_2_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/98274e8fe7a0eba81b5ae7328138a46a3af01955

Modified Files
--------------
contrib/pgbench/pgbench.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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