f50dc2c725
We were never doing clearerr() on the output stream, which results in a message being printed after each result once an EOF is seen: could not print result table: Success This message was added by commit b03436994bcc (in the pg13 era); before that, the error indicator would never be examined. So backpatch only that far back, even though the actual bug (to wit: the fact that the error indicator is never cleared) is older.
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