pgsql: Update obsolete comment

Update obsolete comment

Commit ff27db5d changed this function to no longer return the start
position, but forgot the comment.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/839da3c7d9b76b178910ce2999f7cbbdf6e91f70

Modified Files
--------------
src/bin/pg_basebackup/streamutil.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

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