igt/gem_close_race: Complete conversion to drm_open_driver()

commit e63a0681d95a ("tests/gem_close_race: Use drm_open_driver helper")
left a few raw open() behind. Eliminate them as well!

References: https://bugs.freedesktop.org/show_bug.cgi?id=96605
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
1 file changed