ARPC should return 0 on success, but instead was returning the number of
jiffies left until the timeout.
This caused cport_reset() to report an error and an incorrect error
message to be printed when disabling a connection.
Reported-by: Alex Elder <elder@linaro.org> Signed-off-by: Johan Hovold <johan@hovoldconsulting.com> Tested-by: Alex Elder <elder@linaro.org> Signed-off-by: Alex Elder <elder@linaro.org>