Added missing ASSERT_NE.

Test was failing with segmentation fault (and crashing whole VTS) when
device was not available.

Change-Id: Id0f28d061dc5858fa00ef1bac5f7aa467d860864
Merged-In: Id0f28d061dc5858fa00ef1bac5f7aa467d860864
(cherry picked from commit 70d25b813e26defdef6defee3f238e8065a89bb6)
1 file changed