Commit 90bc0ad41f ("QProcess/Unix: add
failChildProcessModifier()") added this line that set childStartedPipe
so that the failChildProcess() callback had something to write to. But
we left it set on exit from QProcessPrivate::startDetached(), which
caused the QProcess destructor to try and close it.
Noticed when debugging the issue for QTBUG-123083.
Pick-to: 6.7 6.7.0
Task-number: QTBUG-123083
Change-Id: I6818d78a57394e37857bfffd17bbc41c8400270f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>