Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20201112a' into...

Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20201112a' into staging

Migration & virtiofs fixes for 5.2

A bunch of small fixes.

# gpg: Signature made Thu 12 Nov 2020 18:34:41 GMT
# gpg:                using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20201112a:
  virtiofsd: check whether strdup lo.source return NULL in main func
  virtiofsd: check whether lo_map_reserve returns NULL in, main func
  tools/virtiofsd/buffer.c: check whether buf is NULL in fuse_bufvec_advance func
  virtiofsd: Announce submounts even without statx()
  migration: handle CANCELLING state in migration_completion()
  multifd/tls: fix memoryleak of the QIOChannelSocket object when cancelling migration
  migration/dirtyrate: simplify includes in dirtyrate.c
  migration: fix uninitialized variable warning in migrate_send_rp_req_pages()
  migration/multifd: fix hangup with TLS-Multifd due to blocking handshake
  ACPI: Avoid infinite recursion when dump-vmstate
  migration/ram: Fix hexadecimal format string specifier

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