Merge remote-tracking branch 'kraxel/usb.81' into staging

# By Gerd Hoffmann (3) and Hans de Goede (1)
# Via Gerd Hoffmann
* kraxel/usb.81:
  usb-host: raise libusbx minimum version to 1.0.13
  usb: better speed mismatch error reporting
  ehci_free_packet: Discard finished packets when the queue is halted
  xhci: remove XHCIRing->base (unused)

Message-id: 1366705929-11251-1-git-send-email-kraxel@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>