gntdev warning fixes

From: Demi Marie Obenour
Date: Fri Jul 08 2022 - 12:38:14 EST

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The recent gntdev fixes introduced two incorrect WARN_ON()s, which
triggered immediately on my system. Patches for master and all
supported stable versions follow.

Next message: Demi Marie Obenour: "[PATCH 4.19] Ignore failure to unmap -1"
Previous message: Alex Williamson: "Re: [PATCH v4 2/6] vfio: Add a new device feature for the power management"
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