pty: Fix byte loss bug when connecting to pty

When trying to print data to the pty, we first check if it is connected.
If not, we try to reconnect, but we drop the pending data even if we
have successfully reconnected; this makes us lose the first byte of the very
first transmission.
This small fix addresses the issue by checking once more if the pty is connected
after having tried to reconnect.

Signed-off-by: Sebastian Tanase <sebastian.tanase@openwide.fr>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Merge remote-tracking branch 'remotes/kraxel/tags/pull-chardev-20140905-1' into staging

pty: Fix byte loss bug when connecting to pty

# gpg: Signature made Fri 05 Sep 2014 12:57:32 BST 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-20140905-1:
  pty: Fix byte loss bug when connecting to pty

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