Don't crash if we ask for the surface before the window is created. Also clean up NULL/0/nullptr and a c-style cast. Change-Id: I2a5a66ee76a3a12c8ca32847dbe30cc640e924c2 Reviewed-by: Pier Luigi Fiorini <pierluigi.fiorini@hawaiios.org> Reviewed-by: Johan Helsing <johan.helsing@qt.io>
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