Merge tag 'pull-9p-20230608' of https://github.com/cschoenebeck/qemu into staging

* Fix for CVE-2023-2861.

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# gpg: Signature made Thu 08 Jun 2023 08:09:23 AM PDT
# gpg:                using RSA key 96D8D110CF7AF8084F88590134C2B58765A47395
# gpg:                issuer "qemu_oss@crudebyte.com"
# gpg: Good signature from "Christian Schoenebeck <qemu_oss@crudebyte.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: ECAB 1A45 4014 1413 BA38  4926 30DB 47C3 A012 D5F4
#      Subkey fingerprint: 96D8 D110 CF7A F808 4F88  5901 34C2 B587 65A4 7395

* tag 'pull-9p-20230608' of https://github.com/cschoenebeck/qemu:
  9pfs: prevent opening special files (CVE-2023-2861)

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