It's need add format to fprintf to avoid following error in Ubuntu 12.04:
msg.c:59:2: error: format not a string literal and no format arguments [-Werror=format-security]
Signed-off-by: Victor Konyashkin  <vkonyashkin@parallels.com>
Acked-by: Andrey Vagin <avagin@openvz.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>