[PATCH] exa: fix ExaCheckCopyNtoN for exa_classic when source = dest

[Éric Piel]

Hello,

This patch originally written by Yves fixes this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=28077

Could someone review and apply it?

Yves, don't hesitate to add your "Signed-off-by".
Cheers,
Eric

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