Don't exaggerate the number of temporary blocks read.

A read that returns zero bytes (or an error) should not increment
the number of temporary blocks read.

Thomas Munro

Discussion: 
http://postgr.es/m/CAEepm=21xgihg=wag+o5mfotezfn6kfetpfw+rksneqnqqg...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/ee4673ac071f8352c41cc673299b7ec695f079ff

Modified Files
--------------
src/backend/storage/file/buffile.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)


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