gntdev warning fixes

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Subject: gntdev warning fixes
From: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 8 Jul 2022 12:37:44 -0400
Cc: Linux kernel regressions <regressions@xxxxxxxxxxxxxxx>, stable@xxxxxxxxxxxxxxx, Linux kernel mailing list <linux-kernel@xxxxxxxxxxxxxxx>, Xen developer discussion <xen-devel@xxxxxxxxxxxxxxxxxxxx>
Feedback-id: iac594737:Fastmail

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.

Follow-Ups:
- Re: gntdev warning fixes
  - From: Greg KH
- [PATCH 5.18] Ignore failure to unmap INVALID_GRANT_HANDLE
  - From: Demi Marie Obenour
- [PATCH 5.15] Ignore failure to unmap INVALID_GRANT_HANDLE
  - From: Demi Marie Obenour
- [PATCH 5.10] Ignore failure to unmap -1
  - From: Demi Marie Obenour
- [PATCH 5.4] Ignore failure to unmap -1
  - From: Demi Marie Obenour
- [PATCH master] Ignore failure to unmap INVALID_GRANT_HANDLE
  - From: Demi Marie Obenour
- [PATCH 4.19] Ignore failure to unmap -1
  - From: Demi Marie Obenour
- [PATCH 4.14] Ignore failure to unmap -1
  - From: Demi Marie Obenour

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