pgsql: Properly pass third argument to open() in fsync test program.

Log Message:
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Properly pass third argument to open() in fsync test program.

Hiroshi Saito

Modified Files:
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pgsql/src/tools/fsync:
test_fsync.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/fsync/test_fsync.c?r1=1.18&r2=1.19)