drm/tests: Fix a test in drm_test_check_valid_clones()

The drm_atomic_get_crtc_state() function returns error pointers and not
NULL.  Update the check to check for error pointers as well as NULL.

Fixes: 88849f2 ("drm/tests: Add test for drm_atomic_helper_check_modeset()")
Signed-off-by: Dan Carpenter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

Author: Dan Carpenter

drivers/gpu/drm/tests/drm_atomic_state_test.c

@@ -283,7 +283,7 @@ static void drm_test_check_valid_clones(struct kunit *test)
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
 
 	crtc_state = drm_atomic_get_crtc_state(state, priv->crtc);
-	KUNIT_ASSERT_NOT_NULL(test, crtc_state);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state);
 
 	crtc_state->encoder_mask = param->encoder_mask;