wigig_sensing: fix usage of wait_event_interruptible_timeout()

wait_event_interruptable_timeout() returns a positive number in a success
case. This positive number needs to be set to 0 so that the calling
function recognizes it as a success.

Change-Id: Ic8565f95976f98682334da84d950257d43d6a320
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>