Corrected off-by-one error on timer comparison.

Change-Id: I0498980c2c6ec8fd0df651fbf8224c678cbb3b36
Reviewed-on: http://review.couchbase.org/31793
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Brett Lawson <brett19@gmail.com>