GnuTLS: clear errno before any data i/o op, so error logging does not see stale values

[users/heiko/exim.git] / test / log / 0373

2017-07-30 18:51:05.712 H=[V4NET.0.0.0] U=CALLER temporarily rejected connection in "connect" ACL: failed to expand ACL string "${readsocket{TESTSUITE/test-socket}{QUERY-ACL\n}{2s}{*EOL*}}": socket read timed out