C comment: mention why no setting lasterrno in dir_existsfile()

Reported-by: Wei Sun

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: master

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/3fdc1d269345cac24275613f4d6b799e195d95a0

Modified Files
--------------
src/bin/pg_basebackup/walmethods.c | 5 +++++
1 file changed, 5 insertions(+)

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