In pg_upgrade, report errno string if file existence check returns an
error and errno != ENOENT.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b55743a5df13711b8143cd3f53c8abc3416ee520

Modified Files
--------------
contrib/pg_upgrade/relfilenode.c |    5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)

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	Subject: pgsql: Improve handling of INT_MIN / -1 and related cases.
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