OffloadUtilsTest - make test pass on 4.19

It turns out my initial guess that behaviour is 4.14+
and my follow up of 5.4+ were both wrong, and it's
actually 4.19 and up...  Third time's the charm.

Test: build, atest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: If1a454fef37cacb23e4f0f59c0154ae905970d84
1 file changed