pgsql: pgbench: Silence compiler warning

pgbench: Silence compiler warning

Explicitly ignore return value from write(), to silence warning. This
warning only appeared under --disable-thread-safety.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/55f100efc67a0054db586c1804760fb18cfc7b79

Modified Files
--------------
contrib/pgbench/pgbench.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

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