graphics_Gbm: Fix bo fd test

The dmabuf fd (which is what gbm_bo_get_fd returns) is different from
the device's fd. So test that we have a valid fd, but we can't do much
more than that.

BUG=none
TEST=ran the test

Change-Id: I01c9db4ef79fe59714612f833464cfdbba4ed8f5
Reviewed-on: https://chromium-review.googlesource.com/227452
Tested-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Stéphane Marchesin <marcheu@chromium.org>
1 file changed