The current logic that we will disable the read notification if we
have any data at all doesn't make sense for users who use the
receiveDatagram functionality, since they will not make any calls
that trigger the read notifier to be re-enabled unless there is a
datagram ready for us to hand back.
Fixes: QTBUG-105871
Pick-to: 6.7 6.6 6.5
Change-Id: I0a1f1f8babb037d923d1124c2603b1cb466cfe18
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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