pgsql: Correctly handle test durations of more than 2147s in pg_test_ti

Correctly handle test durations of more than 2147s in pg_test_timing.

Previously the computation of the total test duration, measured in
microseconds, accidentally overflowed due to accidentally using signed
32bit arithmetic. As the only consequence is that pg_test_timing
invocations with such, overly large, durations never finished the
practical consequences of this bug are minor.

Pointed out by Coverity.

Backpatch to 9.2 where pg_test_timing was added.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/8cadeb792cd08478a73cb0941bb67f03e8465090

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

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