Fix error message on short read of pg_control

Instead of saying "error: success", indicate that we got a working read
but it was too short.

Branch
------
REL9_4_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/b5f096d50bee5c20023ed05390fdc52aa44a1404

Modified Files
--------------
src/backend/access/transam/xlog.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)

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