fix a watchdogd regression introduced in r308040

The code assumed that 'timeout' and 'timeout_sec' are in sync
which they weren't if no '-t' option was passed to watchdogd.

Reported by: Olivier Smedts <olivier@gid0.org>,

		Alex Deiter <alex.deiter@gmail.com>

Tested by: Olivier Smedts <olivier@gid0.org>,

		Alex Deiter <alex.deiter@gmail.com>

MFC after: 5 days
X-MFC with: r308040