pgsql: Fix progress logging when scale factor is large.

Fix progress logging when scale factor is large.

Integer overflow showed minus percent and minus remaining time something like this.
239300000 of 3800000000 tuples (-48%) done (elapsed 226.86 s, remaining -696.10 s).

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/841a65482d6e198b71a0df987b8b9822608d5ef4

Modified Files
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contrib/pgbench/pgbench.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

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