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xcb: check validity of RandR output info before using it

Andreas Sturmlechner requested to merge asturmlechner/qtbase:asturmlechner/QTBUG-128906-crashfix into kde/5.15

Even if it was not backported to 5.15 upstream, it is simple and seems to make sense: https://bugreports.qt.io/browse/QTBUG-128906

Fixes: QTBUG-128906 Pick-to: 6.8 6.7 6.5 6.2 5.15 Change-Id: Ibafdf4bb9c449b29437b0520299ab407238e5703 Reviewed-by: Tor Arne Vestbø tor.arne.vestbo@qt.io (cherry picked from commit 439e19be)

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