timerfd_settime01: initialise itimerspec new_value

Before kernel validates that fd is valid, it checks itimerspec struct
with timespec_valid(). This struct is currently not initialised in test,
which can cause failures, for example:

timerfd_settime01    1  TFAIL  :  timerfd_settime01.c:121: timerfd_settime()
                        failed unexpectedly; expected: 9 - Bad file
                        descriptor: TEST_ERRNO=EINVAL(22): Invalid argument
timerfd_settime01    2  TFAIL  :  timerfd_settime01.c:121: timerfd_settime()
                        failed unexpectedly; expected: 14 - Bad address:
                        TEST_ERRNO=EINVAL(22): Invalid argument

Fix this by giving fields in this struct some deterministic values
(zero in this patch).

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>