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Fix deletion order in QImageReader/Writer destructors

Andreas Sturmlechner requested to merge asturmlechner/qtbase:del-order-QImageReaderWriter-destructors into kde/5.15

The device would be deleted before the image format handler, and hence be a dangling pointer that could easily cause a crash if the handler or codec would access it on destruction, e.g. for cleanup.

Pick-to: 6.5 6.4 6.2 5.15 Change-Id: I51d16b1feddc5945955ac75a2e8701233dba7b82 Reviewed-by: Paul Olav Tvete paul.tvete@qt.io (cherry picked from commit f091026b)

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