pgsql: Fix off-by-one in pg_xlogdump's fuzzy_open_file().

Fix off-by-one in pg_xlogdump's fuzzy_open_file().

In the unlikely case of stdin (fd 0) being closed, the off-by-one
would lead to pg_xlogdump failing to open files.

Spotted by Coverity.

Backpatch to 9.3 where pg_xlogdump was introduced.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/d1c575230d49929f82c6d91e9b3070a9f4018718

Modified Files
--------------
contrib/pg_xlogdump/pg_xlogdump.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

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