kms_scaling_modes: Close device before exit

Close the device fd before we check for leaks during the atexit
handlers.

Signed-off-by: Chris Wilson <chris.p.wilson@intel.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

tests/kms_scaling_modes.c

@@ -132,6 +132,8 @@ igt_main
 	igt_subtest_with_dynamic("scaling-mode-none")
 		test_scaling_mode(&data, DRM_MODE_SCALE_NONE);
 
-	igt_fixture
+	igt_fixture {
 		igt_display_fini(&data.display);
+		close(data.drm_fd);
+	}
 }