Merge remote-tracking branch 'remotes/kraxel/tags/usb-20190130-pull-request' into...

usb: xhci: fix iso transfers.
usb: mtp: break up writes, bugfixes.
usb: fix lgpl info in headers.
usb: hid: unique serials.

# gpg: Signature made Wed 30 Jan 2019 07:33:21 GMT
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/usb-20190130-pull-request:
  usb-mtp: replace the homebrew write with qemu_write_full
  usb-mtp: breakup MTP write into smaller chunks
  usb-mtp: Reallocate buffer in multiples of MTP_WRITE_BUF_SZ
  usb: implement XHCI underrun/overrun events
  usb: XHCI shall not halt isochronous endpoints
  hw/usb: Fix LGPL information in the file headers
  usb: dev-mtp: close fd in usb_mtp_object_readdir()
  usb: assign unique serial numbers to hid devices

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