Merge remote-tracking branch 'remotes/gkurz-gitlab/tags/9p-next-pull-request' into...

This fixes a Coverity report and improves the fid reclaim logic.

# gpg: Signature made Mon 25 Jan 2021 09:37:28 GMT
# gpg:                using RSA key B4828BAF943140CEF2A3491071D4D5E5822F73D6
# gpg: Good signature from "Greg Kurz <groug@kaod.org>" [full]
# gpg:                 aka "Gregory Kurz <gregory.kurz@free.fr>" [full]
# gpg:                 aka "[jpeg image of size 3330]" [full]
# Primary key fingerprint: B482 8BAF 9431 40CE F2A3  4910 71D4 D5E5 822F 73D6

* remotes/gkurz-gitlab/tags/9p-next-pull-request:
  9pfs: Convert reclaim list to QSLIST
  9pfs: Improve unreclaim loop
  9pfs: Convert V9fsFidState::fid_list to QSIMPLEQ
  9pfs: Convert V9fsFidState::clunked to bool
  9pfs/proxy: Check return value of proxy_marshal()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>