Merge remote-tracking branch 'remotes/gkurz/tags/for-upstream' into staging

Some trivial fixes/cleanup and a fix to cause QEMU to error out gracefully
instead of aborting.

# gpg: Signature made Tue 05 Sep 2017 16:57:19 BST
# gpg:                using DSA key 0x02FC3AEB0101DBC2
# gpg: Good signature from "Greg Kurz <groug@kaod.org>"
# gpg:                 aka "Greg Kurz <groug@free.fr>"
# gpg:                 aka "Greg Kurz <gkurz@linux.vnet.ibm.com>"
# gpg:                 aka "Gregory Kurz (Groug) <groug@free.fr>"
# gpg:                 aka "[jpeg image of size 3330]"
# 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: 2BD4 3B44 535E C0A7 9894  DBA2 02FC 3AEB 0101 DBC2

* remotes/gkurz/tags/for-upstream:
  virtfs: error out gracefully when mandatory suboptions are missing
  9pfs: local: clarify fchmodat_nofollow() implementation
  fsdev: fix memory leak in main()
  9pfs: avoid sign conversion error simplifying the code

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

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