Merge tag 'pull-vfio-20251203' of https://github.com/legoater/qemu into staging

vfio queue:

* Fix vfio-user issues reported by Coverity
* Update vfio-user documentation

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# gpg: Good signature from "Cédric Le Goater <clg@redhat.com>" [full]
# gpg:                 aka "Cédric Le Goater <clg@kaod.org>" [full]

* tag 'pull-vfio-20251203' of https://github.com/legoater/qemu:
  vfio-user: recycle msg on failure
  vfio-user: simplify vfio_user_recv_one()
  vfio-user: refactor out header handling
  vfio-user: clarify partial message handling
  vfio-user: simplify vfio_user_process()
  docs/interop/vfio-user: update protocol specification

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>