Kill urbs and disable read before returning from open on failure to
retrieve the line state.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2: replaced code was using dbg()] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>