Merge tag 'pull-nbd-2023-05-03' of https://repo.or.cz/qemu/ericb into staging

nbd patches for 2023-05-03

- Eric Blake: clear LISTEN_FDNAMES when consuming systemd sockets
- Stefan Hajnoczi: clear export BlockDeviceOps in central location

# -----BEGIN PGP SIGNATURE-----
#
# iQEzBAABCAAdFiEEccLMIrHEYCkn0vOqp6FrSiUnQ2oFAmRSr2gACgkQp6FrSiUn
# Q2qGIQf/Yg7Qwplxz9U+1VZ2sLwMU4NukzeYQFb5K3cdJUz0UzcZW7EZ4eL5Ll1F
# g6UUni+1y+xnTnN+isz062uSo05WCOoLdV0MKYPWjILqe2HpqYLK7Kt2Y8Syh/ET
# aiGoFl2T510A3M8QTNrQIGnul7g3JBRR1ar3mm7u5SD9gKxjlRFftEQLU8GrAEZP
# Bms122pN8Cvu/vRnBraeReNcTwdtWSQYtOvg2BHL+gROWcmS+FAtSpPOjXgjSSTa
# /K5QgBoph5I4H9sJVpN/nbi5aJkhm/A559tv/VR7SP862u6qz3n+2rJSoxee5S7x
# FgxJ/o03ZeTVFfIE3LdVycvOokPMJw==
# =DNEY
# -----END PGP SIGNATURE-----
# gpg: Signature made Wed 03 May 2023 08:00:56 PM BST
# gpg:                using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>" [full]
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>" [full]
# gpg:                 aka "[jpeg image of size 6874]" [full]

* tag 'pull-nbd-2023-05-03' of https://repo.or.cz/qemu/ericb:
  block/export: call blk_set_dev_ops(blk, NULL, NULL)
  systemd: Also clear LISTEN_FDNAMES during systemd socket activation

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