Willem-Jan noticed that the ftdi_sio driver did not support the
TIOCSERGETLSR ioctl, and some userspace programs rely on it. This patch
adds the support.
Reported-by: Willem-Jan de Hoog <wdehoog@exalondelft.nl> Tested-by: Willem-Jan de Hoog <wdehoog@exalondelft.nl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>