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

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

char: restore read callback on a reattached (hotplug) chardev

# gpg: Signature made Thu 13 Mar 2014 10:29:34 GMT using RSA key ID D3E87138
# 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>"

* remotes/kraxel/tags/pull-chardev-1:
  char: restore read callback on a reattached (hotplug) chardev

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