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QXcb: don't dereference pointer before checking

Andreas Sturmlechner requested to merge asturmlechner/qtbase:QXcb-check-pointer-before-deref into kde/5.15

The virtualDesktop pointer is expected to be populated by queryPointer, but that method handles the case that there either is no reply, or that the reply doesn't match, in which case the pointer remains nullptr.

Don't dereference it afterwards without checking.

Addresses code checker warning a179d1087759bb6ca9c3380257bd70d6

Pick-to: 6.1 5.15 Change-Id: I5877f26fd3b49327c0de3f2c918bb606bee8ac57 Reviewed-by: Tor Arne Vestbø tor.arne.vestbo@qt.io (cherry picked from commit c2258e85)

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