WSARecvMsg does not return the sender in WSAMSG::name if WSAMSG::Control
isn't set. This makes no sense, so I'm assuming it's an API quirk we
need to work around.
[ChangeLog][QtNetwork][QUdpSocket] Fixed a regression from Qt 5.9.3
caused by an apparent Win32 API quirk we triggered when using
readDatagram(), resulting in an invalid QHostAddress sender address.
receiveDatagram() was not affected.
Task-number: QTBUG-64718
Change-Id: I71488efd29b645f7b228fffd14f9d84cc205c4b3
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
6a9d076e87