Merge remote-tracking branch 'remotes/kraxel/tags/pull-vnc-20140619-1' into staging

Merge remote-tracking branch 'remotes/kraxel/tags/pull-vnc-20140619-1' into staging

vnc: cleanups and fixes

# gpg: Signature made Thu 19 Jun 2014 12:02:09 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <[email protected]>"
# gpg:                 aka "Gerd Hoffmann <[email protected]>"
# gpg:                 aka "Gerd Hoffmann (private) <[email protected]>"

* remotes/kraxel/tags/pull-vnc-20140619-1:
  vnc: fix screen updates
  vnc: Drop superfluous conditionals around g_strdup()
  vnc: Drop superfluous conditionals around g_free()

Signed-off-by: Peter Maydell <[email protected]>