modetest: Releasing FBs before destroying BO

The framebuffer must be released before releasing the GEM
object which was used for creating the FB.

BUG=None
TEST=Tested with DRM test application - modetest

Signed-off-by: Prathyush K <prathyush.k@samsung.com>
Change-Id: Ibd1176e443c3e3a744279fce56bf66840471e994
Reviewed-on: https://gerrit.chromium.org/gerrit/22142
Reviewed-by: Anush Elangovan <anush@chromium.org>
Commit-Ready: Anush Elangovan <anush@chromium.org>
1 file changed