Merge remote-tracking branch 'remotes/kraxel/tags/pull-ui-20160913-1' into staging

ui: misc small fixes for vnc, spice and curses.

# gpg: Signature made Tue 13 Sep 2016 08:04:46 BST
# gpg:                using RSA key 0x4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/pull-ui-20160913-1:
  vnc: fix qemu crash because of SIGSEGV
  qemu-options.hx: correct spice options streaming-video default document value to 'off'
  ui/curses.c: Clean up nextchr logic
  ui/curses.c: Ensure we don't read off the end of curses2qemu array

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