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Fix potential corruption with image format conversion on arm neon

Andreas Sturmlechner requested to merge asturmlechner/qtbase:QTBUG-109477-heap-corruption into kde/5.15

For tiny scanline lengths, even the initial offset to align on 16 bytes may overflow.

Fixes: QTBUG-109477 Pick-to: 6.5 6.4 6.2 5.15 Change-Id: I198c6fa5a2551a951893515f905bb7cc35479608 Reviewed-by: Qt CI Bot qt_ci_bot@qt-project.org Reviewed-by: Allan Sandfeld Jensen allan.jensen@qt.io (cherry picked from commit 7eccd7ac)

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